[Fuchsia] Fix lsan test filters

Correct name for extensions_unittests filter

Change-Id: I628ea9f42de3fe192336541e0e70e072f612409d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3452702
Auto-Submit: Chong Gu <[email protected]>
Reviewed-by: Brian Sheedy <[email protected]>
Commit-Queue: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#969531}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 3c3d19f..bd5307f 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1604,7 +1604,7 @@
     'modifications': {
       'fuchsia-fyi-x64-asan': {
         'args': [
-          '--test-launcher-filter-file=../../testing/buildbot/filters/fuchsia.lsan.extension_unittests.filter',
+          '--test-launcher-filter-file=../../testing/buildbot/filters/fuchsia.lsan.extensions_unittests.filter',
         ],
       },
       # https://crbug.com/1111979,