MsGraphicsPkg: Correct positioning of trash can icon in list box

- Adjusted CellTrashcanBounds.Left to be CellBounds->Right -
  TrashcanHitAreaWidth to ensure the trash can icon is displayed
  to the right of the list box.
- Updated width parameter in SWM_RECT_INIT2 to use
  TrashcanHitAreaWidth instead of CheckBoxHitAreaWidth for correct
  dimensions.

This resolves the issue of the trash can icon overlapping with the
ListBox's checkbox thus ensuring its related operations work
correctly.

Co-authored-by: Michael Kubacki <[email protected]>

MsGraphicsPkg/Library/SimpleUIToolKit/ListBox.c

@@ -982,9 +982,9 @@ Ctor (
 
       SWM_RECT_INIT2 (
         this->m_pCells[Index].CellTrashcanBounds,
-        CellBounds->Left,
+        CellBounds->Right - TrashcanHitAreaWidth,
         CellBounds->Top,
-        CheckBoxHitAreaWidth,
+        TrashcanHitAreaWidth,
         SWM_RECT_HEIGHT (*CellBounds)
         );
     }