Bug 1597258, follow-up to disable always-target for try-only l10n-conflicts job, r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D55180

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

taskcluster/ci/source-test/mozlint.yml

@@ -252,6 +252,7 @@ l10n-conflicts:
     description: l10n tests for strings with errors and conflicts with cross-channel
     treeherder:
         symbol: text(l1nt-conflicts)
+    always-target: false
     run-on-projects:
         - try
     run: