Do not pass --runtime-arg -classpath in dex2oat_test

There is no need to pass the current runtime classpath as none of the
tests depend on it.

Bug: 38138251
Test: m test-art-host-gtest

(cherry picked from commit 1ccf61377290451b4e5cfe29ece5de3c8c585e0e)

Change-Id: Iff715cca6a0c5b2c741dfd220297509c4cab0526
1 file changed