[DropDownButton] Click event is triggered and active state gets applied upon click when disabled

[zstoyanova9]

Description

When the DropDownButton is disabled, clicking on the component triggers a click event and causes an active state to be applied.

Steps To Reproduce

1. Open the following StackBlitz example - https://stackblitz.com/edit/angular-wayk5zse
2. Click on the DropDownButton.

Screenshots or video

chrome_koStv5GXKS.mp4

Actual Behavior

Clicking on a disabled DropDownButton triggers a click event and causes an active state to be applied.

Expected Behavior

The disabled DropDownButton should not be interactive in any way.

[DanielTakev]

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