Two-way binding support for "first" property of Table

[roldengarm]

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

[X ] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Plunkr Case (Bug Reports)
https://stackblitz.com/edit/github-g488e6?file=src%2Fapp%2Fapp.component.ts

Current behavior

The original issue is that if you have a data set with e.g. 10 pages, you open page 10, and then the data set changes to 5 pages; you will see an empty list.
So I'm trying to reset the pager back to page 0 when the data changes.
The first property is used for that. However, two-way binding does not work, so it stays at 0 during paging. So, setting it to 0 does not trigger paging.
The workaround is to set it to -1, and set it back to 0 in a setTimeout().

However, the fix should be that two-way binding to the first property works.

Expected behavior
Two-way binding to the first property of the table component works.

Minimal reproduction of the problem with instructions
https://stackblitz.com/edit/github-g488e6?file=src%2Fapp%2Fapp.component.ts

Page through the data set. The first property should update.

When clicking the button, it will decrease the data set & revert back to page 0 using my hack.

• Angular version: 7.0

• PrimeNG version: 7.0

• Browser: Chrome