Enable key backup after we reset it (#2170)
Enable key backup after we reset it (#2170)

This ensures that we remember it if bootstrapCrossSigning gets called, so that
the authData gets signed by the master key, if a new key is created.
matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk