update drone.yml

drone.yml

     event: [ tag ]
   depends_on: [ build ]
   settings:
-    title: $${REPO_NAME} $${BRANCH}-$${TAG} $${OS}-$${ARCH} # file or string
+    title: $$REPO_NAME $$BRANCH-$$TAG $$OS-$$ARCH # file or string
     note: RELEASE.md # file or string
     draft: false
     prerelease: false