GUI not working correctly in Linux Mint 20.3 and 21

**Describe the bug**
I enabled USB debugging in the developer options on my Xiaomi Redmi 9A and ADB connects to it and lists it as attached. I installed ADB with `apt install android-sdk-platform-tools` then got the tarball, extracted it with `tar -xf uad_gui-linux.tar.gz` and ran the one file that's inside `./uad_gui-linux`. The GUI opens up, the device is listed as closed and there are some warnings about missing files in the terminal.

Keep up the good work, great project and thanks!

**UAD log**
There is no directory on my system named "runner", nor "gui" in the etc directory btw.

```
2022-09-13 21:10:50 WARN [/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.13.1/src/gles/egl.rs:222] No config found!
2022-09-13 21:10:50 WARN [/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.13.1/src/gles/egl.rs:222] No config found!
2022-09-13 21:10:50 WARN [/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.13.1/src/vulkan/adapter.rs:1157] Missing extensions: ["VK_KHR_timeline_semaphore"]
WARNING: lavapipe is not a conformant vulkan implementation, testing use only.
2022-09-13 21:10:50 WARN [src/gui/mod.rs:102] Trying to download remote UAD list
ERROR: error: device 'KR4PVSQ8NRBYAUUS' not found
2022-09-13 21:10:55 WARN [src/gui/views/list.rs:142] No custom selection imported: No such file or directory (os error 2)
```

The error logs point to graphics stack issues (wgpu-hal, vulkan, lavapipe) and ADB device detection. Start by examining src/gui/mod.rs and src/gui/views/list.rs for the warnings about missing files and remote list download. Check the ADB connection handling and graphics backend initialization, particularly for Linux Mint compatibility. Verify the device detection logic and the expected file paths for custom selections.

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