fix view has already been destroyed error

Author: mmalerba

src/material/sidenav/drawer.ts

@@ -373,6 +373,7 @@ export class MatDrawer implements AfterViewInit, AfterContentChecked, OnDestroy
         distinctUntilChanged((x, y) => {
           return x.fromState === y.fromState && x.toState === y.toState;
         }),
+        takeUntil(this._destroyed),
       )
       .subscribe((event: AnimationEvent) => {
         const {fromState, toState} = event;