[BUG] - Unable to change Enter The Gungeon installation directory

[Damglador]

Describe the bug
r2modman expects EtG.exe, but on Linux native version ships with EtG.x86_64 and EtG.x86. The selector also sets filter for "EtG" files and that's not a valid file format.

To Reproduce
Steps to reproduce the behavior:

1. Go to Settings
2. Click on Change Enter The Gungeon folder
3. Go to EtG folder and try to select native executable
4. See error

Expected behavior
I should be able to select either EtG.exe or native executables

Screenshots

Additional context
I can make a file and rename it to EtG.exe to workaround this