[interpreter] temporarily remove --ignition from test.

This is to avoid polluting fuzzer seeds with the --ignition flag
until we figure out something better.

TBR=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1661333002

Cr-Commit-Position: refs/heads/master@{#33729}

test/mjsunit/ignition/stack-trace-source-position.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --ignition --ignition-filter=f
+// Flags: --ignition-filter=f
 // Flags: --no-turbo
 
 // TODO(yangguo): fix for turbofan