Autocomplete: don't focus input on write value

[yggg]

Issue type

I'm submitting a ... (check one with "x")

• possibly bug report
• feature request

Issue description

Investigate should autocomplete focus input on writeValue. I think it shouldn't as value could be changed on button click, etc. and it should focus input only when value changes because of autocomplete interactions (option mouse/keyboard select).

#2356

Related code:

nebular/src/framework/theme/components/autocomplete/autocomplete.directive.ts

Line 239 in c12873d

this.handleInputValueUpdate(value);

nebular/src/framework/theme/components/autocomplete/autocomplete.directive.ts

Line 304 in c12873d

this.hostRef.nativeElement.focus();