Update celllistmap.jl

[lmiq]

Changes:

• change spf to dt to remove warning when creating video.
• add underscores to p_i and p_j because pi gets highlighted as the number pi.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.89%. Comparing base (8b5b456) to head (d34b729).
Report is 102 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1017       +/-   ##
===========================================
+ Coverage   70.12%   85.89%   +15.77%     
===========================================
  Files          42       39        -3     
  Lines        2718     2560      -158     
===========================================
+ Hits         1906     2199      +293     
+ Misses        812      361      -451     

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