[FIX] sap.ui.core.format.NumberFormat: set default rounding mode for
integer format back to TOWARDS_ZERO

Change-Id: I8ffe4062e62e3aea91ccfb9a91eb138b1bb869cc
BCP: 1482005570
Merge "[FIX] sap.ui.core.format.NumberFormat: set default rounding mode for integer format back to TOWARDS_ZERO"