Fix rigctld segfault when using -P RTS

https://github.com/Hamlib/Hamlib/issues/1182

Segfault-award

@@ -7,6 +7,8 @@ A developer cannot apply for HSHR for segfaults on his/her own code.
 
 Here is the list of the brave fellows:
 
+* Saku Nyland OH1KH v4.5.1, 10/2022, rigctld.c using ptt_type=RTS
+
 * David Kjellquist WB5NHL, v1.1.3, 09/2002, kenwood/ts570.c
 	caught on TS570D backend startup.
 

tests/rigctld.c

@@ -701,7 +701,9 @@ int main(int argc, char *argv[])
     {
         my_rig->state.pttport.type.ptt = ptt_type;
         my_rig->state.pttport_deprecated.type.ptt = ptt_type;
-        my_rig->caps->ptt_type = ptt_type;
+        // This causes segfault since backend rig_caps are const
+        // rigctld will use the rig->state version of this for clients
+        //my_rig->caps->ptt_type = ptt_type;
     }
 
     if (dcd_type != RIG_DCD_NONE)