refactor: remove mw.html dependency from Html.Fragment

[ElectricalBoy]

Summary

Html.Fragment is a thin container of its children that requires no extra processing, i.e., it can be implemented as a simple render function that directly returns its children.

How did you test this change?

busted

[hjpalpha]

have you tested what happens if a module returns fragment (last return to the display)?
i.e. make sure it renders correctly instead of just rendering as table

[ElectricalBoy]

have you tested what happens if a module returns fragment (last return to the display)?

same as current & covered by existing tests