[wasm-simd] Fix constant used in test

This was pointed out in https://crrev.com/c/2290623 but was missed.

Change-Id: I1f0206d1dbc067ee57061f1b5e7085ebe1643906
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2292738
Commit-Queue: Zhi An Ng <zhin@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68810}

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

@@ -3697,7 +3697,7 @@ WASM_SIMD_TEST_NO_LOWERING(S128Const) {
   RunSimdConstTest(execution_tier, lower_simd, expected);
 
   // Keep the first 4 lanes as 0, set the remaining ones.
-  for (int i = 0; i < 0; i++) {
+  for (int i = 0; i < 4; i++) {
     expected[i] = 0;
   }
   for (int i = 4; i < kSimd128Size; i++) {