TBR js/Makefile: Replace spaces with "\ " after find for js files
TBR js/Makefile: Replace spaces with "\ " after find for js files

Make interprets spaces as separating files so this led to missing dependencies

Change-Id: I50197359ae441088ca60182fdbbe3870aa12d9b7
vanadium/js,vanadium/js,vanadium/js,vanadium/js