Small compat fix for emulating PHT keymap.

Trying to add the CLA singed-off thing, attempt 9 :s

Plex-CLA-1.0-signed-off-by: [Jorge Schrauwen] <sjorge@blackdot.be>

resources/inputmaps/keyboard.json

@@ -46,8 +46,9 @@
     "Ctrl\\+Shift\\+R": "host:reload",
     "Ctrl\\+Shift\\+D": "host:toggleDebug",
 
-    // also use I for debug emulating old PHT behaviour
+    // emulate some of of PHT's behaviour
     "I": "host:toggleDebug",
+    "\\\\": "host:fullscreen",
 
     // media keys from the FLIRC and on Linux keyboards
     "Toggle Media Play\\/Pause": "play_pause",