Bug 1352113 - Shippable Builds - Do not run linux32/opt tests, we now run them for linux32-shippable/opt. r=jmaher

Should there end up being a need we can back out this patch and let them run, but :jmaher indicated
he was happy with dropping them entirely and not duplicating.

Differential Revision: https://phabricator.services.mozilla.com/D23383

--HG--
extra : moz-landing-system : lando

taskcluster/ci/test/test-platforms.yml

@@ -19,11 +19,6 @@ linux32/debug:
     build-platform: linux/debug
     test-sets:
         - linux32-tests
-linux32/opt:
-    build-platform: linux/opt
-    test-sets:
-        - linux32-tests
-        - linux32-opt-tests
 linux32-nightly/opt:
     build-platform: linux-nightly/opt
     test-sets: