fix: fix data value and coordinate display on hover

[tlambert03]

#238 added full support for pixel-size scaling, but broke the data-value on hover. This fixes it

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.80%. Comparing base (799d0f4) to head (1505a1e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
+ Coverage   86.79%   86.80%   +0.01%     
==========================================
  Files          50       50              
  Lines        5725     5730       +5     
==========================================
+ Hits         4969     4974       +5     
  Misses        756      756              

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