fix: fix exposure on mda range

[tlambert03]

follow up to #222 (comment)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (3974f92) 91.15% compared to head (d2ba7c0) 91.15%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #225      +/-   ##
==========================================
- Coverage   91.15%   91.15%   -0.01%     
==========================================
  Files          65       65              
  Lines        8047     8046       -1     
==========================================
- Hits         7335     7334       -1     
  Misses        712      712              

Files	Coverage Δ
src/pymmcore_widgets/_mda/_channel_table_widget.py	94.60% <100.00%> (-0.03%)	⬇️
src/pymmcore_widgets/useq_widgets/_channels.py	100.00% <100.00%> (ø)
src/pymmcore_widgets/useq_widgets/_column_info.py	94.83% <100.00%> (ø)

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