Fix YAML parse error in post-install-bucket-hook template (#8523)

The 'set -o pipefail' line was improperly indented outside the YAML block
scalar, causing a parse error when s3.enabled=true and s3.createBuckets
were populated. Moved the line to the beginning of the script block with
correct indentation (12 spaces).

Fixes #8520

Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>

k8s/charts/seaweedfs/templates/shared/post-install-bucket-hook.yaml

@@ -92,6 +92,7 @@ spec:
           - "/bin/sh"
           - "-ec"
           - |
+            set -o pipefail
             wait_for_service() {
               local url=$1
               local max_attempts=60  # 5 minutes total (5s * 60)
@@ -117,7 +118,6 @@ spec:
             wait_for_service "http://$WEED_CLUSTER_SW_MASTER{{ .Values.master.readinessProbe.httpGet.path }}"
             wait_for_service "http://$WEED_CLUSTER_SW_FILER{{ .Values.filer.readinessProbe.httpGet.path }}"
             {{- end }}
-          set -o pipefail
             {{- range $createBuckets }}
             {{- $bucketName := .name }}
             {{- $bucketLock := or .lock .objectLock .withLock }}