Fix flickering on lines

[ibesora]

• This PR fixes Globe: Flickering and missing layers when panning/zooming #5025

The problem was that we were calling a function that changed the stencil value used even if we were not using the result of it. Wrapping everything with an if block made it work

Launch Checklist

• Confirm your changes do not include backports from Mapbox projects (unless with compliant license) - if you are not sure about this, please ask!
• Briefly describe the changes in this PR.
• Link to related issues.
• Include before/after visuals or gifs if this PR includes visual changes.
• Write tests for all new functionality.
• Document any changes to public APIs.
• Post benchmark scores.
• Add an entry to CHANGELOG.md under the ## main section.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.54%. Comparing base (94e2729) to head (751f04b).
Report is 6 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (94e2729) and HEAD (751f04b). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (94e2729)	HEAD (751f04b)
	9	8

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5094       +/-   ##
===========================================
- Coverage   89.06%   67.54%   -21.53%     
===========================================
  Files         269      269               
  Lines       38386    38392        +6     
  Branches     2370     1479      -891     
===========================================
- Hits        34189    25930     -8259     
- Misses       3188    11625     +8437     
+ Partials     1009      837      -172     

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[ibesora]

I've tested the test fails without the fix. You can see the error here.
I've also in-lined the data needed, simplifying it as much as I could to reproduce the bug, and renamed the function to make clear it's updating the stencil id value

[HarelM]

Nice!