comp(dropdown) fixed disabled tests, removed outdated

[Le0Michine]

fixed tests, removed outdated ones.
DropdownService made injectable and added to providers

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (development@8f4a9d4). Click here to learn what that means.

@@              Coverage Diff               @@
##             development    #1605   +/-   ##
==============================================
  Coverage               ?   85.23%           
==============================================
  Files                  ?       85           
  Lines                  ?     2337           
  Branches               ?      301           
==============================================
  Hits                   ?     1992           
  Misses                 ?      246           
  Partials               ?       99

Impacted Files	Coverage Δ
src/dropdown/dropdown.config.ts	100% <100%> (ø)
src/dropdown/dropdown.directive.ts	64.63% <100%> (ø)
src/dropdown/dropdown.module.ts	100% <100%> (ø)
src/dropdown/dropdown.service.ts	82.69% <90.9%> (ø)

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[valorkin]

Great job as always!