main: Fix abstractlink register

Move from qmlRegisterType to qmlRegisterUncreatableType
Since AbstractLink is an class that will only be created in C++ code,
it should be register as qmlRegisterUncreatableType.

The QML code should only provide the LinkConfiguration object to
create the connection and the communication link

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/main.cpp

@@ -58,7 +58,8 @@ int main(int argc, char *argv[])
     qmlRegisterSingletonType<Util>("Util", 1, 0, "Util", Util::qmlSingletonRegister);
 
     // Normal register
-    qmlRegisterType<AbstractLink>("AbstractLink", 1, 0, "AbstractLink");
+    qmlRegisterUncreatableType<AbstractLink>("AbstractLink", 1, 0, "AbstractLink",
+            "Link abstraction class can't be created.");
     qmlRegisterType<Flasher>("Flasher", 1, 0, "Flasher");
     qmlRegisterType<LinkConfiguration>("LinkConfiguration", 1, 0, "LinkConfiguration");
     qmlRegisterType<Ping>("Ping", 1, 0, "Ping");