Add default list setting (#875)

Co-authored-by: Sytone <github@sytone.com>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/875
Reviewed-by: konrad <konrad@kola-entertainments.de>
Co-authored-by: sytone <kolaente@sytone.com>
Co-committed-by: sytone <kolaente@sytone.com>

pkg/routes/api/v1/user_show.go

@@ -68,6 +68,7 @@ func UserShow(c echo.Context) error {
 			DiscoverableByName:           u.DiscoverableByName,
 			DiscoverableByEmail:          u.DiscoverableByEmail,
 			OverdueTasksRemindersEnabled: u.OverdueTasksRemindersEnabled,
+			DefaultListID:                u.DefaultListID,
 		},
 	}