[stable/superset] replaced inappropriate 'with' statement with 'if' (#10833)

Signed-off-by: Garrett Bates <gbates101@gmail.com>

stable/superset/Chart.yaml

@@ -1,6 +1,6 @@
 description: Apache Superset (incubating) is a modern, enterprise-ready business intelligence web application
 name: superset
-version: 1.1.3
+version: 1.1.4
 appVersion: "0.28.1"
 keywords:
 - bi

stable/superset/templates/deployment.yaml

@@ -57,7 +57,7 @@ spec:
             - name: http
               containerPort: 8088
               protocol: TCP
-          {{- with .Values.extraEnv }}
+          {{- if .Values.extraEnv }}
           env:
             {{- range $key, $value := .Values.extraEnv }}
             - name: "{{ $key }}"