[build] Remove obsolete flag from fuzzilli bot

The flag had no effect and was removed from fuzzilli instructions here:
https://github.com/googleprojectzero/fuzzilli/commit/f31bfb7b5a3364e4cbcf7661f621fb5347521560

No-Try: true
Change-Id: If28e79fdf469a4cb665a83793c9fef8c6c2a8232
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2944431
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75000}

infra/mb/mb_config.pyl

@@ -475,8 +475,7 @@
       'release_bot', 'x64', 'cfi_clusterfuzz'],
     'release_x64_fuzzilli': [
       'release_bot', 'x64', 'dcheck_always_on', 'v8_enable_slow_dchecks',
-      'v8_verify_heap', 'v8_verify_csa', 'v8_enable_verify_predictable',
-      'fuzzilli'],
+      'v8_verify_heap', 'v8_verify_csa', 'fuzzilli'],
     'release_x64_msvc': [
       'release_bot_no_goma', 'x64', 'minimal_symbols', 'msvc'],
     'release_x64_correctness_fuzzer' : [