Retain relevant values when switching between profile input forms

[dixhuit]

Currently, if you start adding a new profile from the /manage-profiles page, you get the option to choose from all of the possible input forms available, defaulting to "All":

If you start to populate this form and then, before hitting "Save", change your mind and switch to another form (say "Defender") then you lose all of your previous values as the form initialises. This will happen whenever you switch from one form to another.

There are technical reasons for this that I won't go into here but the UX could definitely be improved with some effort.

Consider tackling #34 first.