[Minuit2] Remove unused Minuit2 code

[guitargeek]

Remove some unused parameter getters and setters for algorithms where these parameters are not relevant.

This makes it easier for the reader of the code what the algorithm parameters actually are.

[github-actions[bot]]

Test Results

    11 files      11 suites   2d 5h 38m 31s :stopwatch:  2 631 tests  2 630 :white_check_mark: 0 :zzz: 1 :x: 27 316 runs  27 315 :white_check_mark: 0 :zzz: 1 :x:

For more details on these failures, see this check.

Results for commit edb886ae.

[mdessole]

Probably there are two spurious failures in the CI. LGTM after formatting!

[guitargeek]

Thanks, good point! I updated the PR with the code formatting.