simplify client assignment logic in coyote script

wile_coyote/bin/coyote

@@ -141,10 +141,7 @@ if __name__ == "__main__":
     # client array elements are the folders where we upload the certificates
     # client is used only with Puppet
     # if we use tld we use 'common' as client
-    if ARGS["--client"]:
-        CLIENTS = ARGS["--client"]
-    if ARGS["--tld"]:
-        CLIENTS = ["common"]
+    CLIENTS = ARGS["--client"] if ARGS["--client"] else ["common"]
 
     # ensure that we need to run certbot
     cert_path = os.path.join("/etc", PROVIDER, "live", FIRST_NAME, "fullchain.pem")