Fix TUI Unlock not possible when lock countdown is invalid but hidden

Mateusz Żebrakrequested to merge
mzebrak/fix-unlock into develop

Steps to reproduce before:

  1. Type in password
  2. Uncheck "should stay unlocked"
  3. Make "Lock countdown (min)" input invalid e.g. by removing its content
  4. Check "should stay unlocked"
  5. Try to unlock - won't be possible

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