Fix activeDialect for custom meta schema

[justin-tay]

Fixes the activeDialect for custom meta schema to return the specification instead of attempting to determine from the iri.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.04%. Comparing base (48ca3c2) to head (550fc2b).
Report is 46 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1084      +/-   ##
============================================
- Coverage     78.90%   78.04%   -0.86%     
- Complexity     1965     2065     +100     
============================================
  Files           172      201      +29     
  Lines          6352     6874     +522     
  Branches       1255     1257       +2     
============================================
+ Hits           5012     5365     +353     
- Misses          867     1032     +165     
- Partials        473      477       +4     

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