fix(build): fix Kokoro release script (#488)

Author: jkwlui

handwritten/firestore/.kokoro/release/publish.cfg

@@ -14,7 +14,7 @@ before_action {
 gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 
 # Use the trampoline script to run in docker.
-build_file: "nodejs-scheduler/.kokoro/trampoline.sh"
+build_file: "nodejs-firestore/.kokoro/trampoline.sh"
 
 # Configure the docker image for kokoro-trampoline.
 env_vars: {
@@ -24,5 +24,5 @@ env_vars: {
 
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
-    value: "github/nodejs-scheduler/.kokoro/publish.sh"
+    value: "github/nodejs-firestore/.kokoro/publish.sh"
 }