Remove an unneeded condition in PHUITimelineEventView.php
Summary: Since rP40e9806e3c88500a67d382a5ec07594325f1b000 changing `if ($items || $has_menu)` to `if ($items)`, the ternary operator condition `$items ? 'a' : 'span'` is always true.
Test Plan: Read the code; run static code analysis.
Reviewers: O1 Blessed Committers, valerio.bozzolan
Reviewed By: O1 Blessed Committers, valerio.bozzolan
Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25976