Fix cleanup of the worker workDir in the init container

The quotes are including the asterisk, which makes it match practically nothing.

templates/worker-statefulset.yaml

@@ -77,7 +77,7 @@ spec:
               for v in $((btrfs subvolume list --sort=-ogen "{{ .Values.concourse.worker.workDir }}" || true) | awk '{print $9}'); do
                 (btrfs subvolume show "{{ .Values.concourse.worker.workDir }}/$v" && btrfs subvolume delete "{{ .Values.concourse.worker.workDir }}/$v") || true
               done
-              rm -rf "{{ .Values.concourse.worker.workDir }}/*"
+              rm -rf "{{ .Values.concourse.worker.workDir }}"/*
           volumeMounts:
             - name: concourse-work-dir
               mountPath: {{ .Values.concourse.worker.workDir | quote }}