Fix issue in UI charm

Scale policy is only available in stateful pods

Change-Id: If632be586851ec21c480cad5e46b72e002b19b99
Signed-off-by: David Garcia <david.garcia@canonical.com>

installers/charm/ui-k8s/reactive/spec_template.yaml

@@ -12,8 +12,6 @@
 #     See the License for the specific language governing permissions and
 #     limitations under the License.
 version: 2
-service:
-  scalePolicy: serial
 containers:
   - name: %(name)s
     image: %(docker_image)s