Don't allow rich text content in non-rich wxTextCtrl in wxOSX.

Explicitly disable rich text content and automatic quotation marks replacement
in normal multiline text controls to make them behave closer to single line
ones and also multiline ones on other platforms.

See #16805.

src/osx/cocoa/textctrl.mm

@@ -580,6 +580,12 @@ wxNSTextViewControl::wxNSTextViewControl( wxTextCtrl *wxPeer, WXWidget w )
     [tv setHorizontallyResizable:NO];
     [tv setAutoresizingMask:NSViewWidthSizable];
 
+    if ( !wxPeer->HasFlag(wxTE_RICH | wxTE_RICH2) )
+    {
+        [tv setRichText:NO];
+        [tv setAutomaticQuoteSubstitutionEnabled:NO];
+    }
+
     [m_scrollView setDocumentView: tv];
 
     [tv setDelegate: tv];