Fix a case of false type equivalency

[povik]

Please see the included test to understand the issue. For both types ->getParentScope() is null, maybe there's a deeper issue which causes the missing scope, but I have been able to resolve some AST inconsistencies with this fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.63%. Comparing base (1ac3d34) to head (b317c0c).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1175   +/-   ##
=======================================
  Coverage   94.63%   94.63%           
=======================================
  Files         195      195           
  Lines       50207    50207           
=======================================
  Hits        47512    47512           
  Misses       2695     2695           

Files with missing lines	Coverage Δ
source/ast/types/Type.cpp	95.46% <100.00%> (ø)

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