Some general ERB cleanup

[elia]

Summary

I bumped into these small fixes while migrating the JS files to stimulus controllers, using a separate PR so that the migration PRs will have less noise.

Checklist

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[codecov[bot]]

Codecov Report

Merging #341 (ef472d5) into main (c44af61) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #341      +/-   ##
==========================================
+ Coverage   97.09%   97.12%   +0.03%     
==========================================
  Files         190      190              
  Lines        4505     4490      -15     
==========================================
- Hits         4374     4361      -13     
+ Misses        131      129       -2     

Impacted Files	Coverage Δ
templates/app/views/products/_products.html.erb	100.00% <100.00%> (ø)
...mplates/app/views/products/_products_grid.html.erb	100.00% <100.00%> (ø)
templates/app/views/products/index.html.erb	90.00% <100.00%> (+15.00%)	:arrow_up:
templates/spec/system/search_spec.rb	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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