Scrcpy v1.17 fails to push files to device

- [OK] I have read the [FAQ](https://github.com/Genymobile/scrcpy/blob/master/FAQ.md).
- [OK] I have searched in existing [issues](https://github.com/Genymobile/scrcpy/issues).
- _Note: I did do a quick research and used some different criteria such as file-push, adb-push but none were related to failing to push a file to a device. My apologies if a thread for this already exists _**for the current scrcpy version**_, but I couldn't find any myself._

**Environment**
- OS: Debian (Linux Mint 19.1 64-bit)
- scrcpy version: 1.17
- installation method: Manual build
- device model: LG K11 (2017)
- Android version: Android 7.0

**Describe the bug**
Pushing files to my device used to work before. I used to use the Snap version, but after 1.16, I removed the Snap one and decided to manually build scrcpy (along with prebuilt server).
While it does launch without complaining, attempting to push a file to a device fails. Terminal output:
```
$ scrcpy --max-size 1024 -S --push-target /storage/3939-6263/Downloads/scrcpy/
INFO: scrcpy 1.17
/usr/local/share/scrcpy/scrcpy-server: 1 file pushed. 5.3 MB/s (34930 bytes in 0.006s)
[server] INFO: Device: LGE LG-M250 (Android 7.0)
INFO: Renderer: opengl
INFO: OpenGL version: 4.6 (Compatibility Profile) Mesa 20.0.8
INFO: Trilinear filtering enabled
INFO: Initial texture: 576x1024
[server] INFO: Device screen turned off
INFO: Request to push /home/rodolfo/Videos/failarmy/meancat.mp4
INFO: Pushing /home/rodolfo/Videos/failarmy/meancat.mp4...
adb: error: failed to copy '/home/rodolfo/Videos/failarmy/meancat.mp4' to '/storage/3939-6263/Downloads/scrcpy/':
remote secure_mkdirs failed: Permission denied
/home/rodolfo/Videos/failarmy/meancat.mp4: 0 files pushed. 568.5 MB/s (1086744 bytes in 0.002s)
ERROR: "adb push" returned with value 1
ERROR: Failed to push /home/rodolfo/Videos/failarmy/meancat.mp4 to /storage/3939-6263/Downloads/scrcpy/
```

I find it interesting that log associates that error with "adb push", which returned 1.
I thought adb push would only return 1 in case my device isn't found. But `adb devices` returns:
```
List of devices attached
LGM250SK99EQFEF6NZ device
```
So I'm out of ideas. Any help is appreciated.
Also, let me know if you need some other info, logs or outputs.

Regards.

Reproduce the failure with scrcpy 1.17 using --push-target and the reported adb push command on the listed Android device setup. Trace how the push target is passed to adb and compare the permission error with a destination where adb push succeeds; done means file pushing works without the remote secure_mkdirs failure.

Written by the indexing model from the issue text.