EditPage: Fix display of errors with multiple messages

EditPage: Fix display of errors with multiple messages

If a status object returns failure with multiple messages (like in
Content::prepareSave()), then previously the first list item would have
a raw asterisk in front of it instead of being a list item because the
<div> tag was on the same line. Adding a newline before the status
object's wikitext will ensure that the first item is interpreted as part
of the list.

Change-Id: If42b3e745f1bd57c6e7964c8e297dab2bf742d4c