[INTERNAL] sap.uxap.ObjectPageHeader - jQuery.sap.byId used
[INTERNAL] sap.uxap.ObjectPageHeader - jQuery.sap.byId used

The _findById method used jQuery find, which isn't safe
with respect to IDs with special characters.
It is now replaced with jQuery.sap.byId, which handles them correctly.
BCP: 1770367511

Change-Id: I145dd962e51c39f2fcd1aec7e67158eb47e8d2d0

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