SDL: Fixed getting the controller index when specifying --virtual (thanks @zturtleman)

SDL Commits
1 
From e3fd8feae6179d975239702a3da3b143bd27a248 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 16 May 2022 06:16:32 -0700
Subject: [PATCH] Fixed getting the controller index when specifying --virtual
 (thanks @zturtleman)

---
 test/testgamecontroller.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/testgamecontroller.c b/test/testgamecontroller.c
index ef0838cb294..086a340413f 100644
--- a/test/testgamecontroller.c
+++ b/test/testgamecontroller.c
@@ -820,7 +820,7 @@ main(int argc, char *argv[])
             }
         }
         if (argv[i] && *argv[i] != '-') {
-            controller_index = SDL_atoi(argv[1]);
+            controller_index = SDL_atoi(argv[i]);
             break;
         }
     }