Don’t add non-default focus ring to NSTextView

NSTextView does not natively show a focus ring by default, and it is
extremely rare thing to do in native applications.

Don't do it in wxTextCtrl either.

src/generic/grideditors.cpp

@@ -460,10 +460,6 @@ void wxGridCellTextEditor::DoCreate(wxWindow* parent,
     text->SetMargins(0, 0);
     m_control = text;
 
-#ifdef __WXOSX__
-    wxWidgetImpl* impl = m_control->GetPeer();
-    impl->EnableFocusRing(false);
-#endif
     // set max length allowed in the textctrl, if the parameter was set
     if ( m_maxChars != 0 )
     {

src/osx/cocoa/textctrl.mm

@@ -1590,7 +1590,6 @@ wxWidgetImplType* wxWidgetImpl::CreateTextControl( wxTextCtrl* wxpeer,
         v = [[wxNSTextScrollView alloc] initWithFrame:r];
         wxNSTextViewControl* t = new wxNSTextViewControl( wxpeer, v, style );
         c = t;
-        c->EnableFocusRing( true );
 
         t->SetStringValue(str);
     }