Return default Passphrase length to 3 words or allow users to select fewer than 6

[grb]

Do vote for the feature request, but FYI, the change in question is already being reverted. The feature request is still relevant, because there is still some arbitrariness in the default limits and in the recommended values.

Avoid Arbitrary Length Restrictions in Generator

Background: As of Desktop and Web Vault version 2024.11.0 (as well as version 2024.11.999 of the redesigned browser extension), the password generator raises the lower limit for passphrase length from 3 words to 6 words (see PR 11675) — corresponding to 78 bits of entropy. Furthermore, for the generation of passwords (random character strings), there currently is a hard limit of 5 characters — corresponding to 15–29 bits of entropy (depending on the character sets included). Proposed Changes: T…