Fix segfault with set_parm KEYERTYPE

Steps to reproduce:
tests/rigctl -m 1 \
set_parm KEYERTYPE BUG

Fixes:
 Thread 1 "rigctl" received signal SIGSEGV, Segmentation fault.
 __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-sse2.S:142
 warning: 142    ../sysdeps/x86_64/multiarch/strlen-sse2.S: File o directory non esistente
 (gdb) bt
 #0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/strlen-sse2.S:142
 #1  0x00007ffac346e300 in __printf_buffer (buf=buf@entry=0x7ffc3bcf40d0, format=0x7ffac38aef17 "%s", ap=0x7ffc3bcf4190, mode_flags=0) at ./stdio-common/vfprintf-process-arg.c:435
 #2  0x00007ffac3491daf in __vsnprintf_internal (string=<optimized out>, maxlen=<optimized out>, format=<optimized out>, args=args@entry=0x7ffc3bcf4190, mode_flags=mode_flags@entry=0) at ./libio/vsnprintf.c:96
 #3  0x00007ffac3469642 in __GI___snprintf (s=s@entry=0x7ffc3bcf4290 "", maxlen=maxlen@entry=32, format=format@entry=0x7ffac38aef17 "%s") at ./stdio-common/snprintf.c:31
 #4  0x00007ffac370b7b9 in dummy_set_parm (rig=0x558fe1991b20, parm=2048, val=...) at dummy.c:1704
 #5  0x0000558fb536afbe in rigctl_set_parm (rig=0x558fe1991b20, fout=0x7ffac35f25c0 <_IO_2_1_stdout_>, fin=<optimized out>, interactive=<optimized out>, prompt=<optimized out>, vfo_opt=<optimized out>, send_cmd_term=13 '\r', ext_resp=0,
     resp_sep=10 '\n', cmd=0x558fb5388000 <test_list+1440>, vfo=536870912, arg1=0x7ffc3bcf4e10 "KEYERTYPE", arg2=0x558fb537fdb1 "1", arg3=0x558fb537ece8 "") at rigctl_parse.c:3829
 #6  0x0000558fb53727d6 in rigctl_parse (my_rig=<optimized out>, fin=<optimized out>, fout=<optimized out>, argv=argv@entry=0x7ffc3bcf6fd8, argc=argc@entry=3, sync_cb=sync_cb@entry=0x0, interactive=<optimized out>, prompt=<optimized out>,
     vfo_opt=<optimized out>, send_cmd_term=<optimized out>, ext_resp_ptr=<optimized out>, resp_sep_ptr=<optimized out>, use_password=<optimized out>) at rigctl_parse.c:1847
 #7  0x0000558fb535cadc in main (argc=<optimized out>, argv=0x7ffc3bcf6fd8) at rigctl.c:801
(cherry picked from commit 12ba558343)

tests/rigctl_parse.c

@@ -3794,11 +3794,13 @@ declare_proto_rig(set_parm)
     }
     else if (RIG_PARM_IS_STRING(parm))
     {
+#if 0
         if (parm == RIG_PARM_KEYERTYPE)
         {
             val.i = atoi(arg2);
         }
         else
+#endif
         {
             val.cs = arg2;
         }