set the code editor in the json view dark mode to be the same colour as the background

Author: lerouxb

packages/compass-crud/src/components/json-editor.tsx

@@ -37,10 +37,10 @@ const editorStyles = css({
 
 const editorDarkModeStyles = css({
   '& .cm-editor': {
-    backgroundColor: `${palette.gray.dark4} !important`,
+    backgroundColor: `${palette.black} !important`,
   },
   '& .cm-gutters': {
-    backgroundColor: `${palette.gray.dark4} !important`,
+    backgroundColor: `${palette.black} !important`,
   },
 });