Update typeahead.directive.ts

[arun-haridas]

Workaround for the issue #1919 (typeahead): show available choices onFocus when minLength == 0

[codecov]

Codecov Report

Merging #2320 into development will increase coverage by 5.46%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           development    #2320      +/-   ##
===============================================
+ Coverage        70.44%   75.91%   +5.46%     
===============================================
  Files              137      121      -16     
  Lines             4094     3612     -482     
  Branches           712      474     -238     
===============================================
- Hits              2884     2742     -142     
+ Misses             912      745     -167     
+ Partials           298      125     -173

Impacted Files	Coverage Δ
src/typeahead/typeahead.directive.ts	78.08% <100%> (+6.19%)	⬆️
src/positioning/ng-positioning.ts	62.92% <0%> (-11%)	⬇️
src/timepicker/reducer/timepicker.reducer.ts	90% <0%> (-1.67%)	⬇️
src/timepicker/timepicker-controls.util.ts	95.31% <0%> (-0.64%)	⬇️
src/spec/ng-bootstrap/test/common.ts	90.32% <0%> (-0.31%)	⬇️
src/timepicker/timepicker.utils.ts	92.2% <0%> (-0.3%)	⬇️
src/alert/alert.module.ts	100% <0%> (ø)	⬆️
src/pagination/pagination.config.ts	100% <0%> (ø)	⬆️
src/accordion/accordion.config.ts	100% <0%> (ø)	⬆️
src/dropdown/bs-dropdown.state.ts	100% <0%> (ø)	⬆️
... and 125 more

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