Do not pass --runtime-arg -classpath to dex2oat in dex fuzz

There is no need for it. It only adds the dex file to be compiled and that
provides no useful information to dex2oat.

Bug: 36044779
Test: build and run the fuzzer
Change-Id: Iae90c4a179f4784029dc77c0530506c5c8dfc158
1 file changed