[INTERNAL][FIX] sap.m.ComboBox: Visual tests corrected
[INTERNAL][FIX] sap.m.ComboBox: Visual tests corrected

Change-Id: Ic800ba4702e5a1f28dd5d954085c5cfbc5cb1f82

SAP/openui5,SAP/openui5,SAP/openui5,SAP/openui5