Simultaneous fitting issues

[rozyczko]

Description

Refactoring of the Fitting widget left some dangling references to old methods, which now reside on separate objects.
This got fixed.

Fixes #3343

How Has This Been Tested?

Local Windows 10 tests

Review Checklist:

[if using the editor, use [x] in place of [ ] to check a box]

Documentation (check at least one)

• There is nothing that needs documenting
• Documentation changes are in this PR
• There is an issue open for the documentation (link?)

Installers

• There is a chance this will affect the installers, if so
  • Windows installer (GH artifact) has been tested (installed and worked)
  • MacOSX installer (GH artifact) has been tested (installed and worked)

Licencing (untick if necessary)

• The introduced changes comply with SasView license (BSD 3-Clause)

[krzywon]

This fix allows the constrained fit window to launch, but when running a constrained fit, I see an error related to bumps v1. I'll add an issue to fix that, but think this PR is likely good to go.

Error I see, for reference (similar issue fixed in #3165):

ERROR: Fitting failed: Traceback (most recent call last): File "sas\qtgui\Perspectives\Fitting\FitThread.py", line 17, in map_getattr return_value = getattr(classInstance, classFunc)(*args) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "sas\sascalc\fit\BumpsFitting.py", line 315, in fit problem.setp_hook() File "sas\sascalc\fit\BumpsFitting.py", line 232, in call self.update() File "M2.background=M3.background M2.scale=M3.scale M2.radius=M3.radius M1.radius=M2.radius M1.background=M2.background M1.scale=M2.scale", line 11, in eval_expressions File "bumps\parameter.py", line 451, in value return int(self.slot) if self.discrete else float(self.slot) ^^^^^^^^^^^^^^^^ File "uncertainties\core.py", line 2611, in raise_error raise TypeError("can't convert an affine function (%s)" TypeError: can't convert an affine function () to float; use x.nominal_value