Add new code owner for CODEOWNERS file (#684)

* Add additional code owner for CODEOWNERS file

* Update CODEOWNERS to correct owner reference

Author: brflood

.github/CODEOWNERS

@@ -5,4 +5,4 @@
 # the repo. Unless a later match takes precedence,
 # @global-owner1 and @global-owner2 will be requested for
 # review when someone opens a pull request.
-*       @microsoft/powerapps-testengine-codeowners
+*       @microsoft/powerapps-testengine-code-owners