refactor(cdk/drag-drop): do not always retain drag handle directive

We recently regressed with lightweight tokens as `CdkDrag` now
injects `CdkDragHandle` without using a lightweight token.

Author: devversion

goldens/size-test.yaml

@@ -1,5 +1,5 @@
 cdk/drag-drop/all-directives: 154096
-cdk/drag-drop/basic: 151903
+cdk/drag-drop/basic: 151353
 material-experimental/mdc-chips/basic: 147607
 material-experimental/mdc-form-field/advanced: 220897
 material-experimental/mdc-form-field/basic: 220060

src/cdk/drag-drop/directives/drag.ts

@@ -191,7 +191,7 @@ export class CdkDrag<T = any> implements AfterViewInit, OnChanges, OnDestroy {
       @Optional() @Inject(CDK_DRAG_CONFIG) config: DragDropConfig,
       @Optional() private _dir: Directionality, dragDrop: DragDrop,
       private _changeDetectorRef: ChangeDetectorRef,
-      @Optional() @Self() private _selfHandle?: CdkDragHandle) {
+      @Optional() @Self() @Inject(CDK_DRAG_HANDLE) private _selfHandle?: CdkDragHandle) {
     this._dragRef = dragDrop.createDrag(element, {
       dragStartThreshold: config && config.dragStartThreshold != null ?
           config.dragStartThreshold : 5,