Using CalypsoTheme for some Activities that didn't have it set.

Without the CalypsoTheme applied overflow menus were inconsistent between Activities.
Merge branch 'develop' into issue/inconsistent-overflow-styles
Forgot to update the Theme activity.
Merge pull request #1965 from wordpress-mobile/issue/inconsistent-overflow-styles

Using CalypsoTheme for some Activities that didn't have it set.
Merge remote-tracking branch 'origin/develop' into feature/1961-add-mentions-to-commenting