Disable video playing on Linux dev mode to fix hot reload problem

lib/controls/audio_video/av_control.dart

@@ -18,7 +18,7 @@ final _useMediaKit = Platform.isAndroid ||
     Platform.isIOS ||
     Platform.isWindows ||
     Platform.isMacOS ||
-    Platform.isLinux;
+    (kReleaseMode && Platform.isLinux);
 
 class AVControl extends StatefulWidget {
   final String videoUrl;