iOS: support edit action 'select'

Now that we don't populate the edit menu from qtquickcontrols
anymore (because of shortcut issues), report to UIKit that
we support select so that the action shows in the menu.

Change-Id: I92508da4e1789c361d778cc6c1c77c86308f4c73
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

src/plugins/platforms/ios/qiostextresponder.mm

@@ -382,6 +382,13 @@
     [self sendShortcut:QKeySequence::Paste];
 }
 
+- (void)select:(id)sender
+{
+    Q_UNUSED(sender);
+    [self sendShortcut:QKeySequence::MoveToPreviousWord];
+    [self sendShortcut:QKeySequence::SelectNextWord];
+}
+
 - (void)selectAll:(id)sender
 {
     Q_UNUSED(sender);