revert BoxProp change

Author: hussam-i-am

packages/react/src/Box/Box.tsx

@@ -12,12 +12,13 @@ import type {
   TypographyProps,
 } from 'styled-system'
 import {background, border, color, flexbox, grid, layout, position, shadow, space, typography} from 'styled-system'
-import type {SxProp} from '../sx'
+import type {BetterSystemStyleObject} from '../sx'
 import sx from '../sx'
 import type {ComponentProps} from '../utils/types'
 
-type StyledBoxProps = SxProp &
-  SpaceProps &
+type StyledBoxProps = {
+  sx?: BetterSystemStyleObject
+} & SpaceProps &
   ColorProps &
   TypographyProps &
   LayoutProps &