Small street module cleanup

[leonardehrenfried]

Summary

This makes some small cleanups that I noticed after merging #7544.

• renaming methods according to our conventions
• make zone geometry required
• fix a small typo in the debug UI

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.08%. Comparing base (c91572f) to head (5e85480).
⚠️ Report is 1 commits behind head on dev-2.x.

Files with missing lines	Patch %	Lines
...vector/geofencing/GeofencingZonesLayerBuilder.java	0.00%	5 Missing ⚠️
...opentripplanner/inspector/vector/LayerBuilder.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #7737   +/-   ##
==========================================
  Coverage      74.08%   74.08%           
- Complexity     21933    21937    +4     
==========================================
  Files           2434     2434           
  Lines          86131    86135    +4     
  Branches        8573     8573           
==========================================
+ Hits           63811    63815    +4     
- Misses         19278    19281    +3     
+ Partials        3042     3039    -3     

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