chore(e2e): remove unused workflow_dispatch inputs from e2e CI configuration

Author: Ansonhkg

.github/workflows/e2e.yml

@@ -7,13 +7,6 @@ on:
       - master
       - develop
   pull_request:
-  workflow_dispatch:
-    inputs:
-      naga_branch:
-        description: 'Branch for Naga tests'
-        required: true
-        default: 'master'
-
 env:
   LIT_STATUS_WRITE_KEY: ${{ secrets.LIT_STATUS_WRITE_KEY }}
   LIT_STATUS_BACKEND_URL: ${{ vars.LIT_STATUS_BACKEND_URL }}