Fix a mismatched method definition in PhabricatorHomeProfileMenuItem

Summary: Fixes T12187. Ref T12190. See T12190 for discussion of why this escaped notice.

Test Plan:

• Commented out the error_reporting() clause around file inclusion.
• Reproduced the error in PHP7.
• Corrected the method signature.
• Reloaded the page, no more error.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12190, T12187

Differential Revision: https://secure.phabricator.com/D17297