Do not propagate option `--get-random` to Vogar in `run-libcore-tests.sh`.

This bit was missing from commit
d6e2c388d0d91c0e7cce66147cc188caed3208b6.

Test: art/tools/run-libcore-tests.sh --mode=device --no-getrandom
Test: Rely on the ART Buildbot.
Bug: 141230711
Change-Id: I25742c477594f9127c79054850787742b9086f43
1 file changed