Let win/asan bot set use_goma=true

Currently, the builder is configured to use goma on the recipe side but
not in mb, causing it to build with -j500 but doing local builds. The bot
running the build does not appreciate that.

Bug: 869973
Change-Id: Id27616762caff158ad660b2b6f2d8ed42a29a41b
Reviewed-on: https://chromium-review.googlesource.com/1176269Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583412}

tools/mb/mb_config.pyl

@@ -915,7 +915,7 @@
     ],
 
     'asan_clang_fuzzer_static_v8_heap_minimal_symbols_release': [
-      'asan', 'fuzzer', 'static', 'v8_heap', 'minimal_symbols', 'release',
+      'asan', 'fuzzer', 'static', 'v8_heap', 'minimal_symbols', 'release_bot',
     ],
 
     'asan_clang_fuzzer_static_v8_heap_minimal_symbols_release_tot': [