webrtc: Fix wrong parent classes for DTLSTransport and ICETransport

Those are GObjects not GstBins
diff --git a/gst-libs/gst/webrtc/dtlstransport.h b/gst-libs/gst/webrtc/dtlstransport.h
index b27e977..207328e 100644
--- a/gst-libs/gst/webrtc/dtlstransport.h
+++ b/gst-libs/gst/webrtc/dtlstransport.h
@@ -53,7 +53,7 @@
 
 struct _GstWebRTCDTLSTransportClass
 {
-  GstBinClass               parent_class;
+  GstObjectClass               parent_class;
 
   gpointer                  _padding[GST_PADDING];
 };
diff --git a/gst-libs/gst/webrtc/icetransport.h b/gst-libs/gst/webrtc/icetransport.h
index 4dad627..86860a2 100644
--- a/gst-libs/gst/webrtc/icetransport.h
+++ b/gst-libs/gst/webrtc/icetransport.h
@@ -53,7 +53,7 @@
 
 struct _GstWebRTCICETransportClass
 {
-  GstBinClass               parent_class;
+  GstObjectClass               parent_class;
 
   gboolean                  (*gather_candidates)        (GstWebRTCICETransport * transport);