fix(cdk/overlay): remove Optional decorator in ConnectedOverlayPositionChange constructor

Author: trik

src/cdk/overlay/position/connected-position.ts

@@ -7,7 +7,6 @@
  */
 
 /** Horizontal dimension of a connection point on the perimeter of the origin or overlay element. */
-import {Optional} from '@angular/core';
 export type HorizontalConnectionPos = 'start' | 'center' | 'end';
 
 /** Vertical dimension of a connection point on the perimeter of the origin or overlay element. */
@@ -92,7 +91,7 @@ export class ConnectedOverlayPositionChange {
       /** The position used as a result of this change. */
       public connectionPair: ConnectionPositionPair,
       /** @docs-private */
-      @Optional() public scrollableViewProperties: ScrollingVisibility) {}
+      public scrollableViewProperties: ScrollingVisibility) {}
 }
 
 /**