fix(proto): ensure ProjectServiceRemoveMemberRequest can be triggered as PROJECT_ROLE_VIEWER

in order to be able to remove yourself

Author: mac641

go/metalstack/api/v2/project.pb.go

@@ -40,7 +40,7 @@ service ProjectService {
   }
   // RemoveMember remove a user from a project
   rpc RemoveMember(ProjectServiceRemoveMemberRequest) returns (ProjectServiceRemoveMemberResponse) {
-    option (project_roles) = PROJECT_ROLE_OWNER;
+    option (project_roles) = PROJECT_ROLE_VIEWER;
     option (auditing) = AUDITING_INCLUDED;
   }
   // UpdateMember update a user for a project