Avoid calling MakePremiumPerAccess twice (bug 890044)

As weird as it seems, removing that whole part solves the issue because
the price is already updated during the creation process just above
during the `bango_account_list_form.save()` call.
Commit from Mozilla Verbatim by user petercpg@mail.moztw.org.: 5002 of 5474 strings translated (16 fuzzy).
Merge branch 'master' of ssh://github.com/mozilla/zamboni
bump app-validator
update app-validator
Commit from Mozilla Verbatim by user petercpg@mail.moztw.org.: 5038 of 5474 strings translated (0 fuzzy).
Merge branch 'master' of ssh://github.com/mozilla/zamboni
Commit from Mozilla Verbatim by user petercpg@mail.moztw.org.: 5041 of 5474 strings translated (0 fuzzy).
add line breaks between parent css rules and nested for @mattbasta
Merge pull request #1145 from ngokevin/csslinebreaks

add line breaks between parent css rules and nested rulesets for @mattbasta
Updated APIPinningMiddleware to use the cache backend
Fixed tests
add marketplace-stats to commonplace handler (bug 917006)
Add per-app install docs (bug 916858)
bump app-validator (bug 915953)
Merge pull request #1143 from davidbgk/890044-avoid-double-call

Avoid calling MakePremiumPerAccess twice (bug 890044)
Commit from Mozilla Verbatim by user mdinic@mozilla.com.: 323 of 5474 strings translated (2 fuzzy).