Fix style for embedded ArrayInputs

Author: fzaninotto

packages/ra-ui-materialui/src/input/ArrayInput/ArrayInput.tsx

@@ -216,7 +216,7 @@ const Root = styled(FormControl, {
     overridesResolver: (props, styles) => styles.root,
 })(({ theme }) => ({
     [`& .${ArrayInputClasses.label}`]: {
-        top: theme.spacing(-0.5),
+        top: theme.spacing(-2),
         left: theme.spacing(-1.5),
     },
 }));

packages/ra-ui-materialui/src/input/ArrayInput/SimpleFormIterator.tsx

@@ -225,6 +225,7 @@ const Root = styled('ul', {
     overridesResolver: (props, styles) => styles.root,
 })(({ theme }) => ({
     padding: 0,
+    marginTop: 0,
     marginBottom: 0,
     '& > li:last-child': {
         borderBottom: 'none',