Revert "fix: padding not working on <Modal> component" (#41029)

This reverts commit 88a36a6a.

frontend/src/metabase/ui/components/overlays/Modal/Modal.styled.tsx

@@ -16,9 +16,6 @@ export const getModalOverrides = (): MantineThemeOverride["components"] => ({
         backgroundColor: theme.fn.rgba(theme.fn.themeColor("bg-black"), 0.6),
       },
     }),
-    defaultProps: {
-      p: DEFAULT_MODAL_SPACING,
-    },
   },
   ModalRoot: {
     defaultProps: {
@@ -35,6 +32,11 @@ export const getModalOverrides = (): MantineThemeOverride["components"] => ({
       pb: "sm",
     },
   },
+  ModalBody: {
+    defaultProps: {
+      p: DEFAULT_MODAL_SPACING,
+    },
+  },
   ModalCloseButton: {
     defaultProps: {
       "aria-label": t`Close`,