AutoComplete: Increased drop-down height on first search when using virtual scroll

[can-oezkan]

Describe the bug

When using the autocomplete component with virtual scroll, the height of the drop-down on first search is increased.

Environment

unrelated

Reproducer

https://primeng.org/autocomplete#virtualscroll

Angular version

unrelated

PrimeNG version

v17.17.0

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

unrelated

Browser(s)

No response

Steps to reproduce the behavior

1. enable virtualScroll
2. Search for an item that only has one or zero suggestions
3. dropdown lists suggestions with increased height
4. Search for an item that has more than one suggestion.
5. dropdown lists suggestions with increased height
6. Search for an item that only has one or zero suggestions
7. dropdown now has correct height

Expected behavior