Correcting client arguments to dynamically_compensate_leakout (sonic-net#16169)

In sonic-net#8149 the multi-asic and multi-dut variants were added to test_qos_sai.py.
This required updating calls to dynamically_compensate_leakout to specify either the src_client or dst_clientbut a couple calls inPGSharedWatermarkTest` passed the wrong client.

For more details on the failure this causes see sonic-net#16167

Summary:
Fixes sonic-net#16167

Author: arista-nwolfe

tests/saitests/py3/sai_qos_tests.py

@@ -4515,7 +4515,7 @@ def runTest(self):
             time.sleep(8)
 
             if pg_min_pkts_num > 0 and check_leackout_compensation_support(asic_type, hwsku):
-                dynamically_compensate_leakout(self.src_client, asic_type, sai_thrift_read_port_counters,
+                dynamically_compensate_leakout(self.dst_client, asic_type, sai_thrift_read_port_counters,
                                                port_list['dst'][dst_port_id], TRANSMITTED_PKTS,
                                                xmit_counters_history, self, src_port_id, pkt, 40)
 
@@ -4580,7 +4580,7 @@ def runTest(self):
                     and (pkts_num <= 1 + margin)
                     and check_leackout_compensation_support(asic_type, hwsku)
                 ):
-                    dynamically_compensate_leakout(self.src_client, asic_type, sai_thrift_read_port_counters,
+                    dynamically_compensate_leakout(self.dst_client, asic_type, sai_thrift_read_port_counters,
                                                    port_list['dst'][dst_port_id], TRANSMITTED_PKTS,
                                                    xmit_counters_history, self, src_port_id, pkt, 40)