Invert the colors of the camera and microphone buttons

So that they use primary color tokens when unmuted, and secondary color tokens when muted. This makes them work like the screen sharing button.

src/room/InCallView.tsx

@@ -645,7 +645,7 @@ export const InCallView: FC<InCallViewProps> = ({
     <MicButton
       size={buttonSize}
       key="audio"
-      muted={!audioEnabled}
+      enabled={audioEnabled}
       onClick={toggleAudio ?? undefined}
       disabled={toggleAudio === null}
       data-testid="incall_mute"
@@ -653,7 +653,7 @@ export const InCallView: FC<InCallViewProps> = ({
     <VideoButton
       size={buttonSize}
       key="video"
-      muted={!videoEnabled}
+      enabled={videoEnabled}
       onClick={toggleVideo ?? undefined}
       disabled={toggleVideo === null}
       data-testid="incall_videomute"