recorder: Enable the keybinding for all modes

There's not really a good reason to restrict the screen recorder
to normal mode and overview, so allow it for all keybinding modes.

https://bugzilla.gnome.org/show_bug.cgi?id=696200

js/ui/components/recorder.js

@@ -20,8 +20,7 @@ const Recorder = new Lang.Class({
         Main.wm.addKeybinding('toggle-recording',
                               this._bindingSettings,
                               Meta.KeyBindingFlags.NONE,
-                              Shell.KeyBindingMode.NORMAL |
-                              Shell.KeyBindingMode.OVERVIEW,
+                              Shell.KeyBindingMode.ALL,
                               Lang.bind(this, this._toggleRecorder));
     },