Disabled button should force removal of ui-state-hover class

[brian428]

Just a small bug, but if you have a button with its disabled property bound:

<button pButton type="button" label="Deselect" icon="fa fa-minus-circle" title="Deselect"
        [disabled]="selectedItems.length === 0" (click)="onDeselectClick()"></button>

If the click handler clears the selectedItems array, the disabled binding is updated and the button becomes disabled. But the ui-state-hover class is still applied to the button, meaning it is now disabled and still lit up with the hover class.

[cagataycivici]

Fix checked in, thank you.