Selects first path if multiple paths present Linux

[ZeoNight]

Describe the bug The installer will select the first path if multiple paths are present.

To Reproduce Steps to reproduce the behavior:

• Get multiple instances of discord canary installed
• Run installer Expected behavior The installer should either ask you which path to install it to, or install it on all of them.

Desktop (please complete the following information):

• OS: Arch, btw
• Powercord version: Latest.

Additional context

• [+] I checked if Discord and/or Powercord are up to date
• [+] I made sure this is not related to an external plugin or a theme

I have created a PR to fix this issue. #639