Bug 1663029 - Run most android-em plain opt tests as tier 1; r=bc

Corresponding debug and shippable tests already run as tier 1, but the plain
opt tests (which run on autoland and try) currently run as tier 2, apparently by
accident.

Differential Revision: https://phabricator.services.mozilla.com/D89255

taskcluster/taskgraph/transforms/tests.py

@@ -994,9 +994,11 @@ def set_tier(config, tasks):
                 'macosx1014-64-qr/debug',
                 'android-em-7.0-x86_64-shippable/opt',
                 'android-em-7.0-x86_64/debug',
+                'android-em-7.0-x86_64/opt',
                 'android-em-7.0-x86-shippable/opt',
                 'android-em-7.0-x86_64-shippable-qr/opt',
-                'android-em-7.0-x86_64-qr/debug'
+                'android-em-7.0-x86_64-qr/debug',
+                'android-em-7.0-x86_64-qr/opt',
             ]:
                 task['tier'] = 1
             else: