fix: Handle .mod files for realms in gnoweb

[RezaRahemtola]

Fixes #2277 to render .mod files for realms

Before:

After:

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.64%. Comparing base (a85b380) to head (198c4fc).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2278   +/-   ##
=======================================
  Coverage   54.64%   54.64%           
=======================================
  Files         578      578           
  Lines       77877    77877           
=======================================
  Hits        42554    42554           
  Misses      32150    32150           
  Partials     3173     3173           

Flag	Coverage Δ
gno.land	61.65% <100.00%> (ø)

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