Enable pwfeedback by default

[Timmmm]

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Change the default so that asterisks are shown when entering passwords. It is still possibly to disable the asterisks by explicitly turning pwfeedback off.

This fixes a major UX pain point for new users. Security is theoretically worse since password lengths are exposed to people watching your screen, but this is an infinitesimal benefit far outweighed by the UX issue. Outside of sudo/login no other password entry interfaces omit asterisks (including others on Linux).

Fixes #1300