syz-verifier: fix tests
syz-verifier: fix tests

Dehardcode syscall indexes from the test.
The indexes are not stable and change after descriptions change
in unrelated ways.

google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller