add state styles

Author: mmalerba

src/material-experimental/mdc-list/action-list.ts

@@ -23,6 +23,4 @@ import {MatListBase} from './list-base';
     {provide: MatListBase, useExisting: MatActionList},
   ]
 })
-export class MatActionList extends MatListBase {
-  _hasRipple = true;
-}
+export class MatActionList extends MatListBase {}

src/material-experimental/mdc-list/nav-list.ts

@@ -33,6 +33,4 @@ import {MatListBase} from './list-base';
     {provide: MatList, useExisting: MatNavList},
   ]
 })
-export class MatNavList extends MatListBase {
-  _hasRipple = true;
-}
+export class MatNavList extends MatListBase {}