Fix keybinding conflicts on 1.14+ (fixes #268)

This fixes both, replay-exclusive keybindings blocking vanilla ones as well as
vanilla keybindings blocking replay-exclusive ones.

The magic happens in Mixin_ContextualKeyBindings.

src/main/java/com/replaymod/extras/FullBrightness.java

@@ -53,7 +53,7 @@ public class FullBrightness extends EventRegistrations implements Extra {
                     updateIndicator(replayHandler.getOverlay());
                 }
             }
-        });
+        }, true);
 
         register();
     }