[wasm] Unskip a test

Debugging with multiple isolates involved is fixed now, thus unskip the
test.

R=thibaudm@chromium.org

Bug: v8:10359, v8:10099
Change-Id: I0134fe9da21c86dd40a559dbd4cf8c998a70be20
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2629512Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72099}

test/mjsunit/mjsunit.status

@@ -846,10 +846,6 @@
   # isolates.
   'wasm/lazy-compilation': [SKIP],
 
-  # Tier down/up Wasm NativeModule in debugging is non-deterministic with
-  # multiple isolates (https://crbug.com/v8/10099).
-  'wasm/tier-down-to-liftoff': [SKIP],
-
   # Tier down/up Wasm functions is non-deterministic with
   # multiple isolates, as dynamic tiering relies on a array shared
   # in the module, that can be modified by all instances.