Fix optimizer verbosity in fixedpoint algorithm selector

[pbrehmer]

Small fix for wrong relative verbosity in select_algorithm(fixedpoint, ...): we want to have optimizer output for each iteration if the global verbosity is 1.

[lkdvos]

Just out of curiosity, and to check that we are consistent:
In MPSKit and KrylovKit, I think we use:
0. no output

1. warnings
2. init and convergence
3. iteration
4. detailed iteration (subalgorithms output)
5. ...

[pbrehmer]

In that case, PEPSKit is not really consistent with MPSKit and KrylovKit. Here, verbosity=1 will print optimization output at every iteration, verbosity=2 will additionally print CTMRG information. I guess then it would make more sense to make the verbosity consistent with the rest... Thanks for pointing that out!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/algorithms/optimization/peps_optimization.jl	96.10% <ø> (ø)
src/algorithms/select_algorithm.jl	95.83% <100.00%> (ø)

... and 1 file with indirect coverage changes

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