fix bug when user login and want to resend register confirmation email (#6482)

models/login_source.go

 		return nil, err
 	}
 
-	if !user.IsActive {
-		return nil, ErrUserInactive{user.ID, user.Name}
-	} else if user.ProhibitLogin {
+	// WARN: DON'T check user.IsActive, that will be checked on reqSign so that
+	// user could be hint to resend confirm email.
+	if user.ProhibitLogin {
 		return nil, ErrUserProhibitLogin{user.ID, user.Name}
 	}
 
 		switch user.LoginType {
 		case LoginNoType, LoginPlain, LoginOAuth2:
 			if user.IsPasswordSet() && user.ValidatePassword(password) {
-				if !user.IsActive {
-					return nil, ErrUserInactive{user.ID, user.Name}
-				} else if user.ProhibitLogin {
+				// WARN: DON'T check user.IsActive, that will be checked on reqSign so that
+				// user could be hint to resend confirm email.
+				if user.ProhibitLogin {
 					return nil, ErrUserProhibitLogin{user.ID, user.Name}
 				}
 

routers/routes/routes.go

 
 	m.Group("/user", func() {
 		// r.Get("/feeds", binding.Bind(auth.FeedsForm{}), user.Feeds)
-		m.Any("/activate", user.Activate)
+		m.Any("/activate", user.Activate, reqSignIn)
 		m.Any("/activate_email", user.ActivateEmail)
 		m.Get("/email2user", user.Email2User)
 		m.Get("/forgot_password", user.ForgotPasswd)