Update add-platform-label workflow label

Author: antonis

.github/workflows/add-platform-label.yml

@@ -13,5 +13,5 @@ jobs:
     steps:
       - uses: andymckay/labeler@e6c4322d0397f3240f0e7e30a33b5c5df2d39e90 # pin@1.0.4
         with:
-          add-labels: 'Platform: React-Native'
+          add-labels: 'React-Native'
           repo-token: ${{ secrets.GITHUB_TOKEN }}