Run tests in Fuchsia builders

This previously failed because Fuchsia wouldn't start due to a Magenta
bug, which seems to have been fixed.

Change-Id: I7eec3117109350695ae835812d96e9e0d6eeeffe
diff --git a/services/cr-buildbucket.cfg b/services/cr-buildbucket.cfg
index a4f8900..7da5804 100644
--- a/services/cr-buildbucket.cfg
+++ b/services/cr-buildbucket.cfg
@@ -76,6 +76,7 @@
   recipe {
     name: "fuchsia"
     properties: "manifest:fuchsia"
+    properties: "tests:apps/test_runner/config/fuchsia.json"
   }
 }