[FIX] sap.m.Popover: close virtual keyboard when popover closes
[FIX] sap.m.Popover: close virtual keyboard when popover closes

The following issue was fixed:
When on iOS8+ and using popover with an input inside, if the input is focused and the popover is closed, the virtual keyboard remains open, because the input element is still focused.

Change-Id: Id92df8c0538435d5958d658e0c05e785558d2e9d
BCP: 1580062754

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