Claim Number Input is not accepting check number X

[chester23491]

Claim Number Input validation is not accepting claims number ending with X.

The check number in the claim number format is not accepted by the mask "claim-number" in bal-input.
E.g. the claim number 4400000321X is not accepted by the mask.

Steps to reproduce the issue

1. Goto the website: https://design.baloise.dev/?path=/story/components-form-input--claim-number-input
2. Enter 4400000321X
3. X is not accepted

[hirsch88]

@nobilo and @Gagne87 could you have a look at this issue?

[nobilo]

We have clarified requirements so one option for claim number is:
44/123456/21.X
so the last character is: 0-9 or X