Bug 943103 - [B2G][Email] Subject and snippet overlap attachment and flagged icons, may cause snippet to wrap so as to not be visible. Regression from bug 917895. r=jrburke

Note that r=jrburke is coming from bug 917895 where James's review request
intent was for this but a misunderstanding resulted in the opposite of the
request happening.
Merge pull request #14297 from asutherland/email-msg-list-regression

Bug 943103 - [B2G][Email] Subject and snippet overlap attachment and flagged icons, may cause snippet to wrap so as to not be visible. Regression from bug 917895. r=jrburke