Correct system parameters property.

prrt/prrt.pyx

@@ -314,11 +314,11 @@ cdef class PrrtSocket:
     property prrt_system_parameters:
         def __get__(self):
             TODO = "" # Measured by X-Lap
-            return PrrtSystemParameters(cprrt.PrrtSocket_get_block_coding_delay,
-                                        cprrt.PrrtSocket_get_redundancy_packet_transmission_delay,
-                                        cprrt.PrrtSocket_get_processing_delay, # processing_delay
-                                        cprrt.PrrtSocket_get_loss_detection_delay, # packet_loss_detection_delay
-                                        cprrt.PrrtSocket_get_source_packet_interval)
+            return PrrtSystemParameters(self.block_coding_delay(),
+                                        self.redundancy_packet_transmission_delay(),
+                                        self.processing_delay(), # processing_delay
+                                        self.packet_loss_detection_delay(), # packet_loss_detection_delay
+                                        self.source_packet_interval())
 
     property block_coding_delay:
         def __get__(self):