ProjectExplorer: Dissolve one of the LinuxDevice constructors

Use the remaining one plus setters.

Change-Id: I21b11d6ace1c7e1e7a3e8691e22b43931137e9e9
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qnx/qnxdevice.cpp

@@ -83,8 +83,9 @@ QnxDevice::QnxDevice()
 }
 
 QnxDevice::QnxDevice(const QString &name, Origin origin, Core::Id id)
-    : RemoteLinux::LinuxDevice(name, origin, id)
 {
+    setupId(origin, id);
+    setDisplayName(name);
     init();
 }