Refactor Procs in collection select at appliance_comments/_compact_form.html.haml

I was in a hurry so i used Procs, to create the contents of content select.

I think we could improve readability if we create a wrapper class (decorator) for ApplianceComment.categories.

Start with appliance_comments/_compact_form.html.haml and inspect how Procs build the content select from ApplianceComment.categories. Trace the existing category behavior before deciding how the wrapper class should be shaped; done means the select still behaves the same without the inline Procs.

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