web/satellite: prevent row action for project owner

This change fixes an issue where users might be able to remove project
owners from a project buy clicking the "invisible" row action button on
the project owner row.

Issue: https://github.com/storj/storj/issues/6345

Change-Id: Ib6f689d65f23539cc3660f72878d6d50fc502e2c

web/satellite/src/components/team/ProjectMemberListItem.vue

@@ -164,6 +164,9 @@ function deleteClicked() {
 }
 
 function toggleDropDown() {
+    if (isProjectOwner.value) {
+        return;
+    }
     appStore.toggleActiveDropdown(props.model.getEmail());
 }