[INTERNAL] sap.m.Popover: Apply correct arrow offset according to the used theme
[INTERNAL] sap.m.Popover: Apply correct arrow offset according to the used theme

Change-Id: I8f4a5fe97af33f2999292a1967b17ebe645e2119

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