[build] Fix tsan builder name

TBR=sergiyb@chromium.org
NOTRY=true
NOTREECHECKS=true

Bug: v8:8009
Change-Id: Ie779b21a488d8a542faa78ffaa625c90058adc35
Reviewed-on: https://chromium-review.googlesource.com/1160489Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54865}

infra/mb/mb_config.pyl

@@ -96,7 +96,7 @@
       'V8 Mac64 ASAN': 'release_x64_asan_no_lsan',
       # Sanitizers.
       'V8 Linux64 ASAN': 'release_x64_asan',
-      'V8 Linux64 TSAN builder': 'release_x64_tsan',
+      'V8 Linux64 TSAN - builder': 'release_x64_tsan',
       # TODO(machenbach): Remove when turning into testers on infra side.
       'V8 Linux64 TSAN': 'release_x64_tsan',
       'V8 Linux64 TSAN - concurrent marking': 'release_x64_tsan',