Port bug 1237182 - Remove unused buildbot support. rs=bustage-fix

taskcluster/ci/test/tests.yml

@@ -52,7 +52,6 @@ xpcshell:
     allow-software-gl-layers: false
     mozharness:
         script: desktop_unittest.py
-        no-read-buildbot-config: true
         config:
             by-test-platform:
                 windows.*:
@@ -91,7 +90,6 @@ mozmill:
     allow-software-gl-layers: false
     mozharness:
         script: desktop_unittest.py
-        no-read-buildbot-config: true
         config:
             by-test-platform:
                 windows.*: