core: prevent making all users inactive when duplicate user is created (#1862)

* core: prevent making all users inactive when duplicate user is created

* skip async group test

src/Simplex/Chat/Controller.hs

@@ -645,6 +645,7 @@ data ChatErrorType
   = CENoActiveUser
   | CENoConnectionUser {agentConnId :: AgentConnId}
   | CEActiveUserExists -- TODO delete
+  | CEUserExists {contactName :: ContactName}
   | CEDifferentActiveUser {commandUserId :: UserId, activeUserId :: UserId}
   | CECantDeleteActiveUser {userId :: UserId}
   | CECantDeleteLastUser {userId :: UserId}