Fixes typo in postgres-operator-ocp311.yml

This typo causes an error when the PVC is created where the access mode
is not set.

Author: jmckulk

installers/kubectl/postgres-operator-ocp311.yml

@@ -184,7 +184,7 @@ spec:
                     value: "alternatesite"
                   - name: STORAGE8_NAME
                     value: "gce"
-                  - name: STORAGE8_ACCESS
+                  - name: STORAGE8_ACCESS_MODE
                     value: "ReadWriteOnce"
                   - name: STORAGE8_SIZE
                     value: "300M"