Fix typo in preview workflow

Author: mphasize

.github/workflows/deploy-preview.yml

@@ -54,5 +54,5 @@ jobs:
           SSH_USER: dokku
           SSH_KEY: ${{ secrets.SSH_KEY_SIR }}
           SSH_HOST: 167.235.152.70
-          REVIEW_APP_NAME: prev-${{ github.event.pull_request.number }}
+          REVIEW_APP_NAME: pre-${{ github.event.pull_request.number }}
           REVIEW_APP_EMAIL: marcus@dpschool.io