[BUG] Converter browser asks if replace -> does not permit

**Description of the error**
For the converter output file, it is possible to select a file which already exists in the browser. Doing so asks if you wish to replace it, but upon saying "yes", the gui will still not enable "RUN!"

**Describe the expected result**
Either no prompt to replace or allow delete-replacement.

**Describe the actual result**
See above

**Suggested fix**
N/A

**Additional details**
N/A