qiosintegration: Set PasswordMaskDelay

This may introduce a privacy issue, however, there does not seem to be a
way to disable this behavior on iOS - there would probably be a setting
if they considered that an issue - so we might as well do the same.

Change-Id: I7a5a6552c36d69b98064b50875562f586b10c0ee
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

src/plugins/platforms/ios/qiosintegration.mm

@@ -208,6 +208,10 @@ QPlatformServices *QIOSIntegration::services() const
 QVariant QIOSIntegration::styleHint(StyleHint hint) const
 {
     switch (hint) {
+    case PasswordMaskDelay:
+        // this number is based on timing the native delay
+        // since there is no API to get it
+        return 2000;
     case ShowIsMaximized:
         return true;
     case SetFocusOnTouchRelease: