Fix form errors (for real)

[mrcasals]

🎩 What? Why?

Fixes form errors and udpates decidim dependency to make thins work properly. See #114 for more info.

📌 Related Issues

• Related to Fix form errors #114
• Fixes #107

📋 Subtasks

None

📷 Screenshots (optional)

`collection_check_boxes:

Single check_boxes:

[codecov-io]

Codecov Report

Merging #117 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #117   +/-   ##
=======================================
  Coverage   97.35%   97.35%           
=======================================
  Files          22       22           
  Lines         340      340           
=======================================
  Hits          331      331           
  Misses          9        9

Impacted Files	Coverage Δ
...dim_hospitalet/surveys/admin/survey_result_form.rb	100% <100%> (ø)	✅
...pp/forms/decidim_hospitalet/surveys/survey_form.rb	100% <100%> (ø)	✅

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