fix bad substition

.github/workflows/create-pr-subnet-evm.yml

@@ -21,7 +21,7 @@ jobs:
         # Get the body of the original PR
           --repo ava-labs/subnet-evm \
           --title "${{ github.event.pull_request.title }}" \
-          --body "This PR was automatically created to sync changes from Coreth.\n\nOriginal PR: ${{ github.event.pull_request.html_url }}\n\n---\n\n${github.event.pull_request.body}" \
+          --body "This PR was automatically created to sync changes from Coreth.\n\nOriginal PR: ${{ github.event.pull_request.html_url }}\n\n---\n\n${{github.event.pull_request.body}}" \
           --base "${{ github.event.pull_request.base.ref }}" \
           --head "${{ github.event.pull_request.head.ref }}" \
           --assignee "${{ github.event.pull_request.user.login }}" \