explicitly finish preferences

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/activity/Preferences.java

@@ -52,6 +52,7 @@ import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatDelegate;
 import android.view.Menu;
 import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.webkit.URLUtil;
@@ -742,6 +743,12 @@ public class Preferences extends PreferenceActivity
         return temp;
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        finish();
+        return super.onOptionsItemSelected(item);
+    }
+
     private void setupActionBar() {
         ActionBar actionBar = getDelegate().getSupportActionBar();
         actionBar.setDisplayHomeAsUpEnabled(true);