Fix variable names

Change I2f4d298a15046c4dc02afbf7582c90a1f17ea4cb added $title = $this->getTitle()
but $title was already defined for the delete reason message, causing the delete log except
to be shown always for the page "MediaWiki:Deletereason-dropdown".
Renaming the previous $title to fix this.

Change-Id: Ibecd181e80d83b0163e17d53b0b1b8c4a366ac1d