[wasm][test] Remove obsolete TODO from interpreter cctest.

The test coverage in question is by now provided by a different set of
mjsunit tests, namely the "mjsunit/wasm/anyref-globals-interpreter"
suite which run all globals tests in --wasm-interpret-all mode.

R=ahaas@chromium.org
TEST=cctest/test-run-wasm-interpreter/ReferenceTypeLocals

Change-Id: I439b1ee74da3c36995bb3d5819e35d4074400868
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1901266Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64812}

test/cctest/wasm/test-run-wasm-interpreter.cc

@@ -449,7 +449,6 @@ TEST(ReferenceTypeLocals) {
     BUILD(r, WASM_REF_IS_NULL(WASM_TEE_LOCAL(0, WASM_REF_NULL)));
     CHECK_EQ(1, r.Call());
   }
-  // TODO(mstarzinger): Test and support global anyref variables.
 }
 
 TEST(TestPossibleNondeterminism) {