Relax password requirements to score of 3 out of 4
Relax password requirements to score of 3 out of 4

This makes it a bit easier to meet the requirements while still requiring a
fairly strong value. The progress bar displays a score of 3 as reaching 100% for
simplicity.

Fixes https://github.com/vector-im/riot-web/issues/9642

matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk