tests.yaml: Remove reference to 'incomplete' directory.

This is a follow-up to 9047ff5.

Author: seanbright

tests/apps/tests.yaml

@@ -6,7 +6,6 @@ tests:
     - dir: 'dial'
     - test: 'originate'
     - dir: 'voicemail'
-    - dir: 'incomplete'
     - dir: 'confbridge'
     - dir: 'page'
     - dir: 'chanspy'