[zbi test] Actually respect disabled field

Change-Id: I0e58afae67291aaef6e421e3d2df3e3c93f19397
diff --git a/recipes/zbi_test.py b/recipes/zbi_test.py
index 9da82ba..78c6e36 100644
--- a/recipes/zbi_test.py
+++ b/recipes/zbi_test.py
@@ -347,8 +347,7 @@
 
   tasks = []
   for name, zbi_test in gn_results.zbi_tests.iteritems():
-    # The test being disabled is indicated by a tag.
-    if 'disabled' in zbi_test.get('tags', []):
+    if zbi_test.get('disabled', False):
       continue  # pragma: no cover
     allowed = set(allowed_device_types)
     specified = set(zbi_test.get('device_types', ['QEMU']))