Hide secret recovery phase words that have already been entered when restoring in mobile wallet

[nop33]

Feedback:

I was in the train when verifying the seed. When i input the next word, the whole seed should not be displayed visibly. You could leave the last few words, but it’s not necessary to have all of them visible on the screen.

[nop33]

Implemented in:

• Hide already entered words of imported mnemonic #1247
  Closing