remove duplicate code in set_option_mod_status()

Remove a duplicate option name lookup loop.  At one time the first
loop checked boolean options and second checked compound options,
but that changed a couple of years ago so that both loops check all
options and the second one became redundant.

src/options.c

@@ -8324,12 +8324,6 @@ set_option_mod_status(const char *optnam, int status)
             return;
         }
     }
-    for (k = 0; allopt[k].name; k++) {
-        if (!strncmpi(allopt[k].name, optnam, strlen(optnam))) {
-            allopt[k].setwhere = status;
-            return;
-        }
-    }
 }
 
 /*