Fix color mismatch between legend and roadmap sections (#7729)

src/data/roadmaps/react/react.json

@@ -3637,7 +3637,7 @@
         "legends": [
           {
             "id": "Z0WmUXWj-7draje3jE1WR",
-            "color": "#2d72d2",
+            "color": "#874efe",
             "label": "Personal Recommendation (Opinion)"
           },
           {
@@ -4461,4 +4461,4 @@
       "focusable": true
     }
   ]
-}
+}