fix(eslint-plugin): [no-use-before-define] false positive for function type arguments

[bradzacher]

Fixes #2527

[typescript-eslint]

Thanks for the PR, @bradzacher!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[codecov]

Codecov Report

Merging #2554 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2554   +/-   ##
=======================================
  Coverage   92.81%   92.81%           
=======================================
  Files         290      290           
  Lines        9453     9456    +3     
  Branches     2647     2647           
=======================================
+ Hits         8774     8777    +3     
  Misses        322      322           
  Partials      357      357           

Flag	Coverage Δ
#unittest	92.81% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...es/eslint-plugin/src/rules/no-use-before-define.ts	94.36% <ø> (ø)
packages/experimental-utils/src/ts-eslint/Scope.ts	100.00% <ø> (ø)