Update the XR manifest configs

Remove the ones provided automatically by the loaders, and the ones enabled by the default on the platform.
Fixes https://github.com/GodotVR/godot_openxr_loaders/issues/19

platform/android/java/app/AndroidManifest.xml

@@ -48,12 +48,6 @@
             android:name="xr_hand_tracking_version_name"
             android:value="xr_hand_tracking_version_value"/>
 
-        <!-- Supported Meta devices -->
-        <!-- This is removed by the exporter if the xr mode is not VR. -->
-        <meta-data
-            android:name="com.oculus.supportedDevices"
-            android:value="all" />
-
         <activity
             android:name=".GodotApp"
             android:label="@string/godot_project_name_string"
@@ -66,9 +60,6 @@
             android:resizeableActivity="false"
             tools:ignore="UnusedAttribute" >
 
-            <!-- Focus awareness metadata is removed at export time if the xr mode is not VR. -->
-            <meta-data android:name="com.oculus.vr.focusaware" android:value="true" />
-
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
                 <category android:name="android.intent.category.LAUNCHER" />