fix(nodebuilder/share): Pass light.Window to shrex getter construction regardless of node type / pruning mode

[renaynay]

Since it is a network constant, shrex getter request routing should be based on the hardcoded light.Window rather than the avail window that is passed to it. light.Window should be used network-wide to determine which peer pool (full or archival) would be most likely to serve the request.

This also fixes a bug where archival nodes would not route historic EDS requests to the archival pool due to AvailabilityWindow being 0.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 44.60%. Comparing base (2469e7a) to head (6f4c5ca).
Report is 104 commits behind head on main.

Files	Patch %	Lines
nodebuilder/share/module.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3466      +/-   ##
==========================================
- Coverage   44.83%   44.60%   -0.24%     
==========================================
  Files         265      273       +8     
  Lines       14620    15369     +749     
==========================================
+ Hits         6555     6855     +300     
- Misses       7313     7719     +406     
- Partials      752      795      +43     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.