No need to check if topic action is enabled()

If the user does not have the needed capability,
the action is not included in the JSON.

Fix stems from David Ostrovsky's comments here:
https://gerrit-review.googlesource.com/#/c/67749/1/

Change-Id: Ief0e18aa3a768333785c62209735bdfa844c81b0
1 file changed