No Password option for T55xx

[naaraxi]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
Add hint that entering 00000000 removes T55XX password

Describe alternatives you've considered
A possible alternative would be a checkbox that disables the new key field and sets the key to 0 (effectively disabling the password bit)

Additional context
Relates to firmware feature request RfidResearchGroup/ChameleonUltra#436

[naaraxi]

I just changed the hint text (and only in English) - can look into the alternative solution instead, if it's preferable.