Bugfix default value cascade:false (#363)

### Feature or Bugfix
- Bugfix

### Detail
- Added `cascade:false` default value for environment key/value tags

### Relates
- #362 

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

frontend/src/views/KeyValueTags/KeyValueTagList.js

@@ -73,7 +73,7 @@ const KeyValueTagList = ({ targetUri, targetType }) => {
             <KeyValueTagUpdateForm
               targetType={targetType}
               targetUri={targetUri}
-              tags={items.length > 0 ? items : [{ key: '', value: '' }]}
+              tags={items.length > 0 ? items : [{ key: '', value: '', cascade: false }]}
               closeUpdate={closeUpdate}
             />
           ) : (