Bug 1607496 - fix taskgraph warning about linux-qr-smoketests caused by missing test-sets line r=jmaher

Changes:

The `test-sets:` line was missing, which caused warnings.

Also correct the name of the test platform combination.

Differential Revision: https://phabricator.services.mozilla.com/D58964

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

taskcluster/ci/test/test-platforms.yml

@@ -76,8 +76,9 @@ linux1804-64-qr/debug:
     test-sets:
         - linux1804-qr-tests
 
-linux1804-64-qr-asan/opt:
+linux1804-64-asan-qr/opt:
     build-platform: linux64-asan/opt
+    test-sets:
         - linux-qr-smoketests
 
 linux1804-64-ccov/opt: