Disable search on folder picker activity

Wasn't implemented and it's hard to get going

Signed-off-by: Álvaro Brey <alvaro.brey@nextcloud.com>

app/src/main/res/menu/activity_folder_picker.xml

@@ -26,6 +26,8 @@
         android:contentDescription="@string/actionbar_search"
         android:icon="@drawable/ic_search"
         android:title="@string/actionbar_search"
+        android:enabled="false"
+        android:visible="false"
         app:actionViewClass="androidx.appcompat.widget.SearchView"
         app:showAsAction="ifRoom" />
     <item