Revert "MDEV-14448: Ctrl-C should not exit the client"

This reverts commit 396313d3.

client/mysql.cc

@@ -1368,23 +1368,12 @@ sig_handler handle_sigint(int sig)
   char kill_buffer[40];
   MYSQL *kill_mysql= NULL;
 
-  /* Terminate if we already tried interrupting. */
-  if (interrupted_query == 2)
+  /* terminate if no query being executed, or we already tried interrupting */
+  if (!executing_query || (interrupted_query == 2))
   {
     tee_fprintf(stdout, "Ctrl-C -- exit!\n");
     goto err;
   }
-  /* If no query being executed, don't exit. */
-  if (!executing_query)
-  {
-    tee_fprintf(stdout, "Ctrl-C\n");
-#ifdef HAVE_READLINE
-    rl_on_new_line(); // Regenerate the prompt on a newline
-    rl_replace_line("", 0); // Clear the previous text
-    rl_redisplay();
-#endif
-    return;
-  }
 
   kill_mysql= mysql_init(kill_mysql);
   if (!mysql_real_connect(kill_mysql,current_host, current_user, opt_password,