Homogenize how toolbutton arrow is detected between

- drawToolButtonComplexControl
- toolButtonSizeFromContents
- and toolButtonSubControlRect

BUG: 367723

kstyle/breezestyle.cpp

@@ -2671,7 +2671,7 @@ namespace Breeze
         // get relevant state flags
         const State& state( option->state );
         const bool autoRaise( state & State_AutoRaise );
-        const bool hasPopupMenu( toolButtonOption->subControls & SC_ToolButtonMenu );
+        const bool hasPopupMenu( toolButtonOption->features & QStyleOptionToolButton::MenuButtonPopup );
         const bool hasInlineIndicator(
             toolButtonOption->features&QStyleOptionToolButton::HasMenu
             && toolButtonOption->features&QStyleOptionToolButton::PopupDelay
@@ -5862,7 +5862,7 @@ namespace Breeze
         // copy option and alter palette
         QStyleOptionToolButton copy( *toolButtonOption );
 
-        const bool hasPopupMenu( toolButtonOption->subControls & SC_ToolButtonMenu );
+        const bool hasPopupMenu( toolButtonOption->features & QStyleOptionToolButton::MenuButtonPopup );
         const bool hasInlineIndicator(
             toolButtonOption->features&QStyleOptionToolButton::HasMenu
             && toolButtonOption->features&QStyleOptionToolButton::PopupDelay