Log Message:
www/hs-yesod-form: update to yesod-form-1.7.9

## 1.7.9

* Added `checkboxesField'` for creating checkbox in more correct way than \ 
original `checkboxesField`
  Function `checkboxesField` marked as deprecated. \ 
[#1843](https://github.com/yesodweb/yesod/pull/1843)

## 1.7.8

* Added `radioField'` for creating radio button in more correct way than \ 
original `radioField`.
  Function `radioField` marked as deprecated. \ 
[#1842](https://github.com/yesodweb/yesod/pull/1842)

## 1.7.7

* Added `optionsFromList'` to create an OptionList from a List, using the \ 
PathPiece instance for the external value and
a custom function for the user-facing value. Also added `optionsEnum'` to create \ 
an OptionList from an enumeration
[#1828](https://github.com/yesodweb/yesod/pull/1828)