[FIX] sap.ui.core.util.File: Wrong data-url delimiter
[FIX] sap.ui.core.util.File: Wrong data-url delimiter

521a4f3952171f659f2c963f7a5519f63df02c0c removed base64 encoding
for the Safari window.open data url solution but also removed the
comma delimiter and left a semi-colon which is wrong.

This caused issues that for example data is truncated until the
first occurence of a comma.

Change-Id: I588737e4f8def51c074a45afe677188403691388

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