[helm] Fix app version (#2842)

charts/kafka-ui/Chart.yaml

@@ -3,5 +3,5 @@ name: kafka-ui
 description: A Helm chart for kafka-UI
 type: application
 version: 0.4.4
-appVersion: 0.4.0
+appVersion: v0.4.0
 icon: https://github.com/provectus/kafka-ui/raw/master/documentation/images/kafka-ui-logo.png