API Token should be case-insensitive

I just set up a new remote collector over the phone with a field technician. We kept getting "Invalid API Token" errors in the message log. After verbally confirming the token several times I asked for a picture and noticed they typed hex A-F as upper-case. Changing these to lower-case fixed the issue. If the API tokens follow RFC 4122 for UUIDs then they should be case-insensitive and stored as the standard preferred lower-case.