android: Use proper namespace for custom attribute

src/frontends/android/app/src/main/res/layout/vpn_profile_select.xml

@@ -14,7 +14,7 @@
     for more details.
 -->
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:strongswan="http://schemas.android.com/apk/res/org.strongswan.android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical" >
@@ -25,6 +25,6 @@
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_weight="1"
-            strongswan:read_only="true" />
+            app:read_only="true" />
 
 </LinearLayout>