[pickers] Fix unused code in PickersToolbar component (@LukasTy) (#15525)

Co-authored-by: Lukas Tyla <[email protected]>

Author: github-actions[bot]

packages/x-date-pickers/src/internals/components/PickersToolbar.tsx

@@ -16,11 +16,10 @@ export interface PickersToolbarProps<TValue, TView extends DateOrTimeViewWithMer
 }
 
 const useUtilityClasses = (ownerState: PickersToolbarProps<any, any>) => {
-  const { classes, isLandscape } = ownerState;
+  const { classes } = ownerState;
   const slots = {
     root: ['root'],
     content: ['content'],
-    penIconButton: ['penIconButton', isLandscape && 'penIconButtonLandscape'],
   };
 
   return composeClasses(slots, getPickersToolbarUtilityClass, classes);