[analyzer] exploded-graph-rewriter: Unforget to censor stmt_ids in the test.

They're not stable across machines.

Fixes buildbots after r375278.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@375286 91177308-0d34-0410-b5e6-96231b3b80d8