[INTERNAL][FIX] sap.m.UploadCollection: removes unused _onFileAllowed
[INTERNAL][FIX] sap.m.UploadCollection: removes unused _onFileAllowed

Removes not used event handling code of _onFileAllowed.

Change-Id: I9385e623af6c6997eded5b8c5756c54fba1f01c0

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