Only set <check_update>true</check_update> for the AppImage

[davidhedlund]

Current Behavior

Both the flatpak package and the appimage generates
<check_update>true</check_update>

Expected Behavior

As pointed out here:
This line

Cemu/src/config/CemuConfig.h

Line 416 in 2e82947

ConfigValue<bool> check_update{true};

should have a macro setting the value to true #if LINUX && !APPIMAGE

[davidhedlund]

@Exzap Please re-read this issue. It's entirely different now. I just re-wrote it to avoid spamming the tracker.

[davidhedlund]

Re-submitted here:

• Only set <check_update>true</check_update> for the AppImage #1415