Look at PRT_HSREND, not PRT_HSDIR, for supports_v3_rendezvous_point

This code seems wrong:

+    rs->supports_v3_rendezvous_point =
+      protocol_list_supports_protocol(tok->args[0], PRT_HSDIR,
+                                      PROTOVER_HS_RENDEZVOUS_POINT_V3);

It should say "PRT_HSREND", not "PRT_HSDIR".

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