The most common thing that we do with fab! is:
fab!(:thing) { Fabricate(:thing) }
This commit adds a shorthand for this which is just simply:
fab!(:thing)
i.e. If you omit the block, then, by default, you'll get a `Fabricate`d object using the fabricator of the same name.
Why this change?
Group mention notifications are currently placed in the "Others" tab
of the user menu which is odd considering that mentioned notifications
are in the reply tab. This commit changes it such that group mention
notifications are displayed in the reply tab as well.