[v8][wasm] Adjust settings of the wasm_code_fuzzer.

Neither the corpus nor the dictionary are helpful for the fuzzer at the
moment.

R=mmoroz@chromium.org

Review-Url: https://codereview.chromium.org/2298153002
Cr-Commit-Position: refs/heads/master@{#415598}

testing/libfuzzer/fuzzers/BUILD.gn

@@ -245,8 +245,6 @@ fuzzer_test("v8_wasm_code_fuzzer") {
   deps = [
     "//v8:wasm_code_fuzzer",
   ]
-  dict = "dicts/v8_wasm.dict"
-  seed_corpus = "//v8/test/fuzzer/wasm_code/"
   libfuzzer_options = [ "max_len=500" ]
 }