[INTERNAL][FIX] sap.f.Avatar: Fixed border width
[INTERNAL][FIX] sap.f.Avatar: Fixed border width

AvatarGroup generates selector about focus of Avatar without context.

BCP: 2070197660
Change-Id: Id7b532c40e07752eed1aa39f97d1b6970d71845a

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