Suppress on sender's deeper user subpages

WikiLove fails to suppress on sender's own user subpages
deeper than one level (= with more than one "/" in the page
name).  This patch prevents the WikiLove tab from being
shown on own user subpages by finding root title instead of
base title.

Change-Id: I6204709119c1272b8fae524a28690c59e796943e
Merge "Suppress on sender's deeper user subpages"