Generate wxEVT_KILL_FOCUS for wxSearchCtrl under Mac

Do it using controlTextDidChange: notification as it's already done for
wxTextCtrl and wxComboBox.

See #22702.

Closes #22706.

(cherry picked from commit 0bb0fe24d137ad7768055cddd4686ed22aba17e2)

src/osx/cocoa/srchctrl.mm

@@ -75,6 +75,14 @@
         impl->controlTextDidChange();
 }
 
+- (void)controlTextDidEndEditing:(NSNotification *) aNotification
+{
+    wxUnusedVar(aNotification);
+    wxWidgetCocoaImpl* impl = (wxWidgetCocoaImpl* ) wxWidgetImpl::FindFromWXWidget( self );
+    if ( impl )
+        impl->DoNotifyFocusLost();
+}
+
 - (NSArray *)control:(NSControl *)control textView:(NSTextView *)textView completions:(NSArray *)words
  forPartialWordRange:(NSRange)charRange indexOfSelectedItem:(int*)index
 {