Drop description from 403 flask test case

Older versions of werkzeug pass the description parameter back
in the description.  As the description is never actually validated
in the test case, dropping it seems OK.

Change-Id: Icd547113d8fe918f35a97c4a5de220b3aaace5cd
Closes-Bug: 1242486
Merge "Drop description from 403 flask test case"