[INTERNAL][FIX] sap.m.Input: Fix for border styling of the input's
suggestion popup in HCB

Changed the border styling of the suggestion popup of the input in
accord with new design requirements:
-- added a box shadow;
-- replaced the existing border with a wider (2px) @sapHCStandardFG
border

Change-Id: I3ef40df653f2f7e618a34c2c86d181b3c275cd93
Merge "[INTERNAL][FIX] sap.m.Input: Fix for border styling of the input's suggestion popup in HCB"