Use default UL/UL-C pwd/key as default value for key input

[mishamyte]

What's new

For simplification of unlocking UL11/UL21/NTAGs (where pwd is applicable) and UL C we are prepopulating input with default transport key for that chip type.

It's crucial for Ultralight C, where key size is 16 bytes

Verification

• Read tag of corresponding type with locked pages
• Chose unlock with manual input
• Validate a value in input
• (Optional) If you tag has default pwd - proceed with pre-populated value

Regression validation:

• Ensure input accepts manually entered value and tries to unlock using it

Checklist (For Reviewer)

• PR has description of feature/bug
• Description contains actions to verify feature/bugfix
• I've built this code, uploaded it to the device and verified feature/bugfix

[mishamyte]

Proposed as a backport to OFW in flipperdevices/flipperzero-firmware#4208