Sketch can not be compiled after removing a file.

Arduino IDE 1.8.10 On Windows 10.

Steps to reproduce.

1. Open sketch and verify/compile.
2. Add new file to project (Sketch/Add file..)
3. Verify/compile the sketch
4. Delete the file you just added from the IDE menu
5. Verify/compile the sketch

What happens:
Compile fails with an error
```
unable to create a folder to save the sketch: mkdir sketch: Access is denied.
Error compiling for board Arduino Nano.
```

With verbose mode the error is:
```
C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Teemu Ikonen\Documents\Arduino\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10810 -build-path C:\Users\TEEMUI~1\AppData\Local\Temp\arduino_build_791852 -warnings=default -build-cache C:\Users\TEEMUI~1\AppData\Local\Temp\arduino_cache_564665 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17 -prefs=runtime.tools.avr-gcc.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino5.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Users\Teemu Ikonen\Documents\Arduino\geiger_testbench\geiger_testbench.ino
C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\Teemu Ikonen\Documents\Arduino\libraries -fqbn=arduino:avr:nano:cpu=atmega328old -ide-version=10810 -build-path C:\Users\TEEMUI~1\AppData\Local\Temp\arduino_build_791852 -warnings=default -build-cache C:\Users\TEEMUI~1\AppData\Local\Temp\arduino_cache_564665 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17 -prefs=runtime.tools.avr-gcc.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino5.path=C:\Users\Teemu Ikonen\AppData\Local\Arduino15\packages\arduino\tools\avr-gcc\7.3.0-atmel3.6.1-arduino5 -prefs=runtime.tools.arduinoOTA.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -prefs=runtime.tools.arduinoOTA-1.3.0.path=C:\Program Files (x86)\Arduino\hardware\tools\avr -verbose C:\Users\Teemu Ikonen\Documents\Arduino\geiger_testbench\geiger_testbench.ino
Using board 'nano' from platform in folder: C:\Program
Using core 'arduino' from platform in folder: C:\Program
unable to create a folder to save the sketch: mkdir C:\Users\TEEMUI~1\AppData\Local\Temp\arduino_build_791852\sketch: Access is denied.
Error compiling for board Arduino Nano.
```

Start by reproducing the Sketch/Add file, delete, and compile sequence in Arduino IDE 1.8.10 on Windows 10, then inspect the corresponding sketch-file workflow and arduino-builder invocation. Done means compiling after deletion no longer fails while creating the temporary sketch folder, including for the Arduino Nano case.

Written by the indexing model from the issue text.