[FIX] sap.m.SearchField: improper focusing in IE
[FIX] sap.m.SearchField: improper focusing in IE

- workaround for a bug in IE: no blur on a focused
  element when document.hasFocus() returns false

Change-Id: I4d0838747847c8da7d9789251be75437ba545643
BCP: 1570799171

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