fix follow_path for objects with start_pos

[ArbitRandomUser]

PR Checklist

If you are contributing to Javis.jl, please make sure you are able to check off each item on this list:

• Did I update CHANGELOG.md with whatever changes/features I added with this PR?
• Did I make sure to only change the part of the file where I introduced a new change/feature?
• Did I cover all corner cases to be close to 100% test coverage (if applicable)?
• Did I properly add Javis dependencies to the Project.toml + set an upper bound of the dependency (if applicable)?
• Did I properly add test dependencies to the test directory (if applicable)?
• Did I check relevant tutorials that may be affected by changes in this PR?
• Did I clearly articulate why this PR was made the way it was and how it was made?

Link to relevant issue(s)
Closes #
#491

How did you address these issues with this PR? What methods did you use?
the points along which the objects should follow should have object.start_pos subtracted from them.

[codecov-commenter]

Codecov Report

Merging #496 (b2953ca) into main (1e74392) will decrease coverage by 0.50%.
The diff coverage is 100.00%.

❗ Current head b2953ca differs from pull request most recent head d6e5e78. Consider uploading reports for the commit d6e5e78 to get more accurate results

@@            Coverage Diff             @@
##             main     #496      +/-   ##
==========================================
- Coverage   77.74%   77.24%   -0.51%     
==========================================
  Files          38       38              
  Lines        1991     2070      +79     
==========================================
+ Hits         1548     1599      +51     
- Misses        443      471      +28     

Impacted Files	Coverage Δ
src/action_animations.jl	95.37% <100.00%> (-0.44%)	⬇️
src/Javis.jl	96.65% <0.00%> (-0.28%)	⬇️
src/Shape.jl	0.00% <0.00%> (ø)
src/backgrounds.jl	100.00% <0.00%> (ø)
src/luxor_utils.jl	100.00% <0.00%> (ø)
src/structs/JPath.jl	100.00% <0.00%> (ø)
src/util.jl	97.36% <0.00%> (+0.05%)	⬆️
src/structs/Frames.jl	96.72% <0.00%> (+0.05%)	⬆️
src/svg2luxor.jl	97.03% <0.00%> (+0.13%)	⬆️
... and 4 more

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