Fix Standard-Size Form Bugs & Media File Links

[jpham93]

|#444 https://projects.vta.org/projects/copy-center/work_packages/444
|#447 https://projects.vta.org/projects/copy-center/work_packages/447
|#448 https://projects.vta.org/projects/copy-center/work_packages/448

There are a few bugs on the Standard-Size Form that currently requires our attention. Also, we need to add route Protection to our media files that contain Business Card PDFs and other user uploads.

Requirements:

• Protect media routes with Business Card PDFs and user uploads. Only admin access should be allowed.
• Create form validation for Other Binding/Finishing Options under levels 2 & 3. Right now, these options can be ignored without any categories selected.
• Fix the non-selectable the textarea of Multiple Paper Sizes.