Changed the way windows modifiers are probed in an attempt to fix right alt-key issues

modules/juce_gui_basics/native/juce_win32_Windowing.cpp

@@ -973,7 +973,7 @@ public:
         if (isKeyDown (VK_SHIFT))   keyMods |= ModifierKeys::shiftModifier;
         if (isKeyDown (VK_CONTROL)) keyMods |= ModifierKeys::ctrlModifier;
         if (isKeyDown (VK_MENU))    keyMods |= ModifierKeys::altModifier;
-        if (isKeyDown (VK_RMENU))   keyMods &= ~(ModifierKeys::ctrlModifier | ModifierKeys::altModifier);
+        if (isKeyDown (VK_RMENU))   keyMods = (keyMods & ~ModifierKeys::ctrlModifier) | ModifierKeys::altModifier;
 
         currentModifiers = currentModifiers.withOnlyMouseButtons().withFlags (keyMods);
     }