uikit: Fixed a typo in a comment.

src/main/uikit/SDL_uikit_main.c

@@ -1,5 +1,5 @@
 /*
-    SDL_uiki_main.c, placed in the public domain by Sam Lantinga  3/18/2019
+    SDL_uikit_main.c, placed in the public domain by Sam Lantinga  3/18/2019
 */
 #include "../../SDL_internal.h"