rdp: Fixed codec initialisations

This patch fixes NSC codec initialisation that was not done (an
erronous copy'n paste).
The remoteFx context must be resetted when we go through an activation
sequence
diff --git a/src/compositor-rdp.c b/src/compositor-rdp.c
index ec758df..eb43f59 100644
--- a/src/compositor-rdp.c
+++ b/src/compositor-rdp.c
@@ -555,7 +555,7 @@
 	rfx_context_set_pixel_format(context->rfx_context, RDP_PIXEL_FORMAT_B8G8R8A8);
 
 	context->nsc_context = nsc_context_new();
-	rfx_context_set_pixel_format(context->rfx_context, RDP_PIXEL_FORMAT_B8G8R8A8);
+	nsc_context_set_pixel_format(context->nsc_context, RDP_PIXEL_FORMAT_B8G8R8A8);
 
 	context->encode_stream = Stream_New(NULL, 65536);
 }
@@ -703,6 +703,8 @@
 static BOOL
 xf_peer_activate(freerdp_peer *client)
 {
+	RdpPeerContext *context = (RdpPeerContext *)client->context;
+	rfx_context_reset(context->rfx_context);
 	return TRUE;
 }