NO-ISSUE fix: if expression

.gitea/workflows/pr-title-check.yaml

@@ -1,11 +1,5 @@
 name: PR Title Check
-on:
+on: [pull_request]
-  pull_request:
-    types:
-      - opened
-      - edited
-      - synchronize
-      - reopened
 
 jobs:
   pr-title-check:
@@ -16,7 +10,7 @@ jobs:
 
       - name: Check PR title
         run: |
-          title="${{ gitea.event.pull_request.title }}"
+          title=${{ gitea.event.pull_request.title }}
           if [[ ! "$title" =~ "^(BLOG-[0-9]+|NO-ISSUE) [A-Z].+$" ]]; then
             echo 'The title is not meet the format `BLOG-XXX Title title title`'
             exit 1