also use "password-encrypted" for the 2nd autoconfig configuration

intended for deltachat, which doesn't look at the value. encrypted may be a
better default.

as discussied in #251

http/autoconf.go

@@ -141,7 +141,7 @@ func autoconfHandle(w http.ResponseWriter, r *http.Request) {
 			443,
 			tlsMode,
 			email,
-			"password-cleartext",
+			"password-encrypted",
 		}
 		resp.EmailProvider.IncomingServers = append(resp.EmailProvider.IncomingServers, incomingALPN)
 	}
@@ -163,7 +163,7 @@ func autoconfHandle(w http.ResponseWriter, r *http.Request) {
 			443,
 			tlsMode,
 			email,
-			"password-cleartext",
+			"password-encrypted",
 		}
 		resp.EmailProvider.OutgoingServers = append(resp.EmailProvider.OutgoingServers, outgoingALPN)
 	}