[INTERNAL][FIX] Core: don't register rendering timer until after init
[INTERNAL][FIX] Core: don't register rendering timer until after init

Change-Id: Ie1d4572bb4e8db2219fddc5cbf2c0fb7ee562239

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