Use the new get_ctrl_dir() function, don't default to the cwd if the

SBBSCTRL env var isn't set (defualts to "/sbbs/ctrl" instead, like the other
utils).

src/sbbs3/scfg/scfg.c

@@ -175,11 +175,7 @@ int main(int argc, char **argv)
 	cfg.size=sizeof(cfg);
 
     memset(&uifc,0,sizeof(uifc));
-    p=getenv("SBBSCTRL");
-    if(p!=NULL)
-        SAFECOPY(cfg.ctrl_dir,p);
-    else
-		getcwd(cfg.ctrl_dir,sizeof(cfg.ctrl_dir));
+    SAFECOPY(cfg.ctrl_dir, get_ctrl_dir());
 
 	uifc.esc_delay=25;