lupdate: Regenerate QtScript/JS parser

The latest version of qlalr produces output that is different from
the previous version, even if the grammar file didn't change.

Also remove stale line from QtScript/JS grammar. (It had mistakenly
been removed from the generated parser but not from the input file.)

Change-Id: Icfc7d154230b5e908a9617c7c1a3cd607879bef9
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>