[wasm] Disable wasm/streaming-error-position for predicatable mode.

The predicatable mode sets --single-threaded flag, which disables
--wasm-async-compilation. The test relies on async compilation.

Change-Id: I49dae829506c69f21f148cc9c9565c136abcda42
Reviewed-on: https://chromium-review.googlesource.com/880842Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50793}

test/mjsunit/mjsunit.status

@@ -659,6 +659,8 @@
 
   # BUG(v8:7166).
   'd8/enable-tracing': [SKIP],
+  # Relies on async compilation which requires background tasks.
+  'wasm/streaming-error-position': [SKIP],
 }],  # 'predictable == True'
 
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