Border styles create a double-border on native search ctrl, just use the one Apple draws.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59466 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/cocoa/srchctrl.mm

@@ -166,6 +166,7 @@ wxWidgetImplType* wxWidgetImpl::CreateSearchControl( wxTextCtrl* wxpeer,
     [[v cell] setCancelButtonCell:nil];
 
     wxNSSearchFieldControl* c = new wxNSSearchFieldControl( wxpeer, v );
+    c->SetNeedsFrame( false );
     c->SetStringValue( str );
     return c;
 }