fix(scope-manager): fix visiting of TSImportType

[bradzacher]

Fixes #3006

[typescript-eslint]

Thanks for the PR, @bradzacher!

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[codecov]

Codecov Report

Merging #3008 (f0f175b) into master (3cb3aad) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3008   +/-   ##
=======================================
  Coverage   92.72%   92.72%           
=======================================
  Files         314      314           
  Lines       10663    10664    +1     
  Branches     3023     3023           
=======================================
+ Hits         9887     9888    +1     
  Misses        355      355           
  Partials      421      421           

Flag	Coverage Δ
unittest	92.72% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ckages/scope-manager/src/referencer/TypeVisitor.ts	89.36% <100.00%> (+0.11%)	⬆️