fix detecting scroll behavior in edge

[SteveRusin]

'scrollBehavior' in document.documentElement!.style

returns true after using overlay due to this code. This check returns false for an edge before opening modal

from MDN

If you set a property to undefined but do not delete it, the in operator returns true for that property.

I faced this issue in production in my app. I'm using virtual scrolling for mat-select in our modal.
After trying to open select and restore the scrolling index of the selected item app crashes in the edge.
Please have a look at this issue.

This is my code to restore the index

  @ViewChild(CdkVirtualScrollViewport, { static: true }) vsViewport: CdkVirtualScrollViewport;
/// indx => index of the selected item
this.vsViewport.scrollToIndex(indx);

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[crisbeto]

There's a fix for this already in #17223.

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