jf-actvitity: functioning route, ombi fixes

forgot to switch branches before doing a fix for #455, so it's in here
too. OmbiUserByJfID/getOmbiUser takes an optional email *string, to
optionally pass an override email address to search with, used when
changing it.

migrations.go

@@ -189,7 +189,7 @@ func linkExistingOmbiDiscordTelegram(app *appContext) error {
 		idList[user.JellyfinID] = vals
 	}
 	for jfID, ids := range idList {
-		ombiUser, err := app.getOmbiUser(jfID)
+		ombiUser, err := app.getOmbiUser(jfID, nil)
 		if err != nil {
 			app.debug.Printf("Failed to get Ombi user with Discord/Telegram \"%s\"/\"%s\": %v", ids[0], ids[1], err)
 			continue