Minor fix in resonator flux dependence

[Edoardo-Pedicillo]

• coupling unit conversion
• update fix

http://login.qrccluster.com:9000/I83qd7qkTzOTWnvl_VOBKA==/

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.
• Compatibility with Qibo modules (Please edit this section if the current pull request is not compatible with the following branches).
  • Qibo: master
  • Qibolab: main
  • Qibolab_platforms_qrc: main

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.50%. Comparing base (c77f563) to head (8911e60).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #998      +/-   ##
==========================================
- Coverage   97.56%   97.50%   -0.06%     
==========================================
  Files         123      123              
  Lines        9714     9713       -1     
==========================================
- Hits         9477     9471       -6     
- Misses        237      242       +5     

Flag	Coverage Δ
unittests	97.50% <100.00%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...l/protocols/flux_dependence/resonator_crosstalk.py	97.38% <100.00%> (+1.30%)	⬆️
...ocols/flux_dependence/resonator_flux_dependence.py	98.26% <100.00%> (-0.02%)	⬇️

... and 3 files with indirect coverage changes