Update plugins.qmltypes for Qt 5.13

Task-number: QTBUG-73739
Change-Id: Ia7aad40aa100b168b9cf2aae511473ce88820a41
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

src/imports/qmlwebsockets/plugins.qmltypes

@@ -38,7 +38,7 @@ Module {
         }
         Signal {
             name: "statusChanged"
-            Parameter { name: "status"; type: "Status" }
+            Parameter { name: "status"; type: "QQmlWebSocket::Status" }
         }
         Signal {
             name: "activeChanged"