Disable forceFSScreen setting on Embedded

We don't expect Embedded to be connected to more than one display, so it
makes no sense there. Also, it should always be in fullscreen.

resources/settings/settings_description.json

@@ -144,6 +144,7 @@
       },
       {
         "value": "forceFSScreen",
+        "platforms_excluded": [ "oe" ],
         "default": ""
       }
     ]