macosx: fixed minor display issue with the Equalizer button (#4654)

modules/gui/macosx/equalizer.h

@@ -27,7 +27,6 @@
 @interface VLCEqualizer : NSObject
 {
     IBOutlet id o_btn_equalizer;
-    IBOutlet id o_btn_equalizer_embedded;
     IBOutlet id o_ckb_2pass;
     IBOutlet id o_ckb_enable;
     IBOutlet id o_fld_preamp;

modules/gui/macosx/equalizer.m

@@ -142,7 +142,6 @@ static bool GetFiltersStatus( intf_thread_t *p_intf,
 {
     int i;
     [o_btn_equalizer setToolTip: _NS("Equalizer")];
-    [o_btn_equalizer_embedded setToolTip: _NS("Equalizer")];
     [o_ckb_2pass setTitle: _NS("2 Pass")];
     [o_ckb_2pass setToolTip: _NS("Apply the "
         "equalizer filter twice. The effect will be sharper.")];
@@ -330,13 +329,11 @@ static bool GetFiltersStatus( intf_thread_t *p_intf,
     {
         [o_window orderOut:sender];
         [o_btn_equalizer setState:NSOffState];
-        [o_btn_equalizer_embedded setState:NSOffState];
     }
     else
     {
         [o_window makeKeyAndOrderFront:sender];
         [o_btn_equalizer setState:NSOnState];
-        [o_btn_equalizer_embedded setState:NSOnState];
     }
 }
 
@@ -363,6 +360,12 @@ static bool GetFiltersStatus( intf_thread_t *p_intf,
     vlc_object_release( p_object );
 }
 
+- (void)windowDidBecomeKey:(NSNotification *)aNotification
+{
+    [o_btn_equalizer setState: NSOnState];
+}
+
+
 - (void)windowWillClose:(NSNotification *)aNotification
 {
     [o_btn_equalizer setState: NSOffState];