Revert maximize should not remove modal blockScroll

[viceice]

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Plunkr Case (Bug Reports)
Please demonstrate your case at stackblitz by using the issue template below. Issues without a test case have much less possibility to be reviewd in detail and assisted.

https://stackblitz.com/edit/github-f9d8dx

Current behavior

If i set modal, blockScroll and maximizable and open the dialog, the body scroll ist disabled.
If i then maximize and revert the dialog, the body is scrollable.

Expected behavior

The body is not scrollable after revert maximize.

Minimal reproduction of the problem with instructions

https://stackblitz.com/edit/github-f9d8dx

Here this.blockScroll should be checked.

primeng/src/app/components/dialog/dialog.ts

Line 315 in 3605d41

this.domHandler.addClass(document.body, 'ui-overflow-hidden');

I can send a PR. The fix will be very easy.

What is the motivation / use case for changing the behavior?

Simply because this is a bug. 😁

Please tell us about your environment:

Windows Server 2012R2, Windows 10 18.03

• Angular version: 6.X, 7.X

• PrimeNG version: 6.1.6

• Browser: all

• Language: all

• Node (for AoT issues): node --version = v10.13.0