Patching validators persists across requests

[daniel-ac-martin]

This module patches the validators on a per request basis. Unfortunately, due to the way that hmpo-form-controller works, these patches persist across requests.

For more details see: UKHomeOffice/passports-form-controller#42

[daniel-ac-martin]

My opinion is that fixing this first requires a fix in hmpo-date-controller. Once that is done this module must be updated to reflect the fix.

[daniel-ac-martin]

This could also be fixed by detecting based on the fields config. (Will require some new config.) That is probably a better approach than patching the validators per request even though it requires some more set up.

[daniel-ac-martin]

#5 Will make this the correct approach anyway.