macosx: Cache level pref should set file-caching

The cache level dropdown in simple preferences previously did not change
file-caching, only network-caching, disc-caching and live-caching.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit c422cdda)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/simple_prefs.m

@@ -908,6 +908,7 @@ static inline void save_module_list( intf_thread_t * p_intf, id object, const ch
         else
         {
             msg_Dbg( p_intf, "Adjusting all cache values to: %i", (int)[[o_input_cachelevel_pop selectedItem] tag] );
+            CaC( "file-caching" );
             CaC( "network-caching" );
             CaC( "disc-caching" );
             CaC( "live-caching" );