[FIX] sap.m.Popover: arrow color corrected
[FIX] sap.m.Popover: arrow color corrected

Corrected color of the arrow when there is a NavContainer in the Popover
and transition between two pages occurs

Change-Id: I4c1583ae06a0f0580adf08d07c4dcaf372b19969
BCP: 1580011045

nzamani/openui5,SAP/openui5,olirogers/openui5,SAP/openui5,nzamani/openui5,cschuff/openui5,SAP/openui5,SAP/openui5,cschuff/openui5,SQCLabs/openui5,olirogers/openui5,SQCLabs/openui5,nzamani/openui5,olirogers/openui5,cschuff/openui5,SQCLabs/openui5