Update OWNERS_ALIASES to fix approver bot

DirectXMan12 · DirectXMan12 · commit 77946106323d · 2018-08-13T12:40:03.000-04:00
The OWNERS_ALIASES needs aliases as map keys, not as list items.
diff --git a/OWNERS_ALIASES b/OWNERS_ALIASES
@@ -1,8 +1,8 @@
 # See the OWNERS docs: https://git.k8s.io/community/contributors/devel/owners.md
 
 aliases:
-  - controller-runtime-admins:
-    - directxman12
-    - droot
-    - pwittrock
-  - controller-runtime-maintainers:
+  controller-runtime-admins:
+  - directxman12
+  - droot
+  - pwittrock
+  controller-runtime-maintainers: []
