Fix asset name

Author: gorhill

.github/workflows/mv3.yml

@@ -41,7 +41,7 @@ jobs:
           GITHUB_TOKEN: ${{ github.token }}
         with:
           tag_name: ${{ env.TAGNAME }}
-          release_name: ${{ env.RELEASENAME }}
+          release_name: ${{ env.TAGNAME }}
           prerelease: true
       - name: Upload uBOLite MV3 package
         uses: actions/upload-release-asset@v1