Add Hidden Fields to /Report/ page

**[Original report](https://bitbucket.org/laborstudents/chemical-inventory-new/issue/149) by Kye Hoover (Bitbucket: [eykrevooh](https://bitbucket.org/eykrevooh), GitHub: [eykrevooh](https://github.com/eykrevooh)).**

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Add a hidden field for each drop down option. When the a select is done the hidden fields value is updated.

Remove JS the enables all disabled elements on submit. No longer needed if there are hidden fields.

Start at the /Report/ page and inspect each dropdown, its hidden-field handling, and the JavaScript that enables disabled elements during submit. Add a hidden field for each dropdown option, update its value when the selection changes, and remove the now-unneeded submit behavior; verify that submitted values remain available.

Written by the indexing model from the issue text.