Fix manifold bridge horizon in step_toward

[murrellb]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.65%. Comparing base (68f7c5d) to head (9f31d3a).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/manifolds.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   49.76%   49.65%   -0.12%     
==========================================
  Files           8        8              
  Lines         430      431       +1     
==========================================
  Hits          214      214              
- Misses        216      217       +1     

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