fix(typeahead): inside of onpush components

[valorkin]

PR Checklist

Before creating new PR, please take a look at checklist below to make sure that you've done everything that needs to be done before we can merge it.

• read and followed the CONTRIBUTING.md guide.
• built and tested the changes locally.
• added/updated tests.
• added/updated API documentation.
• added/updated demos.

[codecov]

Codecov Report

Merging #2946 into development will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@              Coverage Diff               @@
##           development   #2946      +/-   ##
==============================================
- Coverage         70.7%   70.7%   -0.01%     
==============================================
  Files              137     137              
  Lines             4165    4168       +3     
  Branches           737     738       +1     
==============================================
+ Hits              2945    2947       +2     
  Misses             914     914              
- Partials           306     307       +1

Impacted Files	Coverage Δ
src/typeahead/typeahead.directive.ts	70.61% <66.66%> (-0.07%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 37b8454...b708339. Read the comment docs.

[YevheniiaMazur]

Tested, looks good