Display numbers in top row

Entering numbers currently requires to switch to a different layer which, depending on the amount and distribution of numbers in your password, can get a bit annoying. When I want to unlock my password database in Keepass2Android, it shows 4 rows of keys with numbers in the top row and the remaining 3 rows being the usual character ones. At least on my Pinephone there's enough vertical space for a 4th row. If we're concerned about space on other devices, we could maybe make the number row configurable via the config file.