remove a line for PR test

Author: one-and-only

.github/workflows/shellcheck.yml

@@ -1,12 +1,11 @@
 jobs:
   lint:
     runs-on: ubuntu-latest
-    on: pull_request
     steps:
       - name: Checkout code
       - uses: actions/checkout@v1
       - name: Run Shellcheck on Script Files
         uses: azohra/shell-linter@latest
         with:
           path: "*.sh"
-          severity: "error"
+          severity: "error"