core: add a lower bound to coastFromEnd low speed limit

[eckter]

Fix #5677

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (db02439) 19.59% compared to head (f611c05) 19.59%.
Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #5679   +/-   ##
=========================================
  Coverage     19.59%   19.59%           
- Complexity     2322     2323    +1     
=========================================
  Files           886      886           
  Lines        105816   105816           
  Branches       2573     2572    -1     
=========================================
+ Hits          20736    20739    +3     
+ Misses        83570    83569    -1     
+ Partials       1510     1508    -2     

Flag	Coverage Δ
core	78.80% <100.00%> (+0.02%)	⬆️

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