Correct connector line in lens! for non-linear scales

[BeastyBlacksmith]

Description

Fix #4975

Attribution

• I am listed in .zenodo.json (see How to get acknowledged #3503)

Things to consider

• Does it work on log scales?
• Does it work in layouts?
• Does it work in recipes?
• Does it work with multiple series in one call?
• PR includes or updates tests?
• PR includes or updates documentation?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.03%. Comparing base (fa65e7d) to head (6bb4873).
Report is 36 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5055      +/-   ##
==========================================
- Coverage   89.77%   89.03%   -0.74%     
==========================================
  Files          40       40              
  Lines        8780     8252     -528     
==========================================
- Hits         7882     7347     -535     
- Misses        898      905       +7     

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