[1227] [v5.2] Fix broken ToS checkbox handling

[orenyk]

Resolves #1227 on release-v5.2

Should be a quick merge based on #1228, but for consistency let's get this looked over.

[orenyk]

Also note that this lacks tests; those will only be merged into master (due to being blocked on #416).

[esoterik]

I get an error box that complains about improperly checked-off procedures when I haven't accepted the TOS (and that checkbox is unchecked) and am not assigning an equipment item, but the procedures are properly checked off.

[esoterik]

Also, if the check out fails the TOS is still marked as accepted if it was not accepted previously and the checkbox was ticked. I know I pointed that out before but I'm not sure where I commented on github so I'm going to comment again here.

Found it, it's in the actual issue, though the error still occurs on this branch.

[orenyk]

Ok, the notice is going into the master branch, so I'm merging this.