Fix ZDOCmd.Mgmt_Rtg_req translation typo introduced in #41

Author: puddly

zigpy_znp/zigbee/zdo_converters.py

@@ -137,7 +137,7 @@
     ZDOCmd.Mgmt_Rtg_req: (
         (
             lambda addr, StartIndex: (
-                c.ZDO.MgmtLqiReq.Req(
+                c.ZDO.MgmtRtgReq.Req(
                     Dst=addr.address,
                     StartIndex=StartIndex,
                 )