Band::check_residuals: don't call beta_projectors.prepare/dismiss
Band::check_residuals: don't call beta_projectors.prepare/dismiss

control.verbosity=2 crashing with beta_projectors.prepare called twice in
succession.

toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,electronic-structure/sirius