motd: fix fetching of motd for riseup provider

in b1796790 the config.Provider was changed from the provider URL to the provider name but the check fetching motd expected an URL this updates the case statement to match the provider name instead of the provider URL

fixes #881 (closed)

pkg/motd/fetch.go

@@ -21,7 +21,7 @@ func FetchLatest() []Message {
 	url := os.Getenv("MOTD_URL")
 	if url == "" {
 		switch config.Provider {
-		case "riseup.net":
+		case "riseup":
 			url = riseupMOTD
 		default:
 			return empty