[FIX] sap.m.ActionSelect: disabled items are incorrectly displayed

- fix display of disabled items in ActionSelect according
  to the visual specification

Change-Id: I2a12b5b01950c18bab62777dd2ad2a4ab86145ae
[INTERNAL] sap.ui.core.BrowserScrollbar, sap.m.BrowserScrollbar - Fixed
scrollbars for controls in sap.ui

Change-Id: I2bab633161f528c41410c5bd39723d0f2b27cf3d
Merge "[INTERNAL] sap.ui.core.BrowserScrollbar, sap.m.BrowserScrollbar - Fixed scrollbars for controls in sap.ui"
Merge "[FIX] sap.m.ActionSelect: disabled items are incorrectly displayed"