fix the pod end point when given a module name

[haarg]

The find_pod method would sometimes return the source and sometimes a full record from Elasticsearch. Fix the return to always return the source, and adjust the caller to work with this form.

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 59.74%. Comparing base (ac26b19) to head (fdc134b).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/MetaCPAN/Server/Model/Source.pm	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1386   +/-   ##
=======================================
  Coverage   59.74%   59.74%           
=======================================
  Files         135      135           
  Lines        4399     4399           
  Branches      671      671           
=======================================
  Hits         2628     2628           
  Misses       1517     1517           
  Partials      254      254           

Files with missing lines	Coverage Δ
lib/MetaCPAN/Query/File.pm	76.31% <100.00%> (ø)
lib/MetaCPAN/Server/Controller/Pod.pm	68.18% <100.00%> (ø)
lib/MetaCPAN/Server/Model/Source.pm	59.01% <0.00%> (ø)

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