Fix the handling of of the kernel change from "quiet" to "low-power"

A coming kernel change will convert "quiet" to "low-power" due to how
platform_profile can now have multiple registered handlers.
(kernel 6.14 est)

Fixes #609

rog-control-center/src/main.rs

@@ -35,7 +35,9 @@ async fn main() -> Result<()> {
     // If we're running under gamescope we have to set WAYLAND_DISPLAY for winit to
     // use
     if let Ok(gamescope) = env::var("GAMESCOPE_WAYLAND_DISPLAY") {
-        env::set_var("WAYLAND_DISPLAY", gamescope);
+        if !gamescope.is_empty() {
+            env::set_var("WAYLAND_DISPLAY", gamescope);
+        }
     }
 
     // Try to open a proxy and check for app state first

rog-control-center/src/types/fan_types.rs

@@ -9,6 +9,7 @@ impl From<Profile> for PlatformProfile {
             Profile::Balanced => PlatformProfile::Balanced,
             Profile::Performance => PlatformProfile::Performance,
             Profile::Quiet => PlatformProfile::Quiet,
+            Profile::LowPower => PlatformProfile::LowPower,
         }
     }
 }
@@ -19,6 +20,7 @@ impl From<PlatformProfile> for Profile {
             PlatformProfile::Balanced => Profile::Balanced,
             PlatformProfile::Performance => Profile::Performance,
             PlatformProfile::Quiet => Profile::Quiet,
+            PlatformProfile::LowPower => Profile::LowPower,
         }
     }
 }