ucrtbase: Fix a typo in the previous commit

This fixes multiple definition errors if linking in both sprintf
and snprintf.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-crt/stdio/ucrt_sprintf.c

diff --git a/mingw-w64-crt/stdio/ucrt_sprintf.c b/mingw-w64-crt/stdio/ucrt_sprintf.c
index b9029d5..628a26a 100644
--- a/mingw-w64-crt/stdio/ucrt_sprintf.c
+++ b/mingw-w64-crt/stdio/ucrt_sprintf.c
@@ -17,4 +17,4 @@
   __builtin_va_end(ap);
   return ret;
 }
-int __cdecl (*__MINGW_IMP_SYMBOL(snprintf))(char *__restrict__, const char *__restrict__, ...) = sprintf;
+int __cdecl (*__MINGW_IMP_SYMBOL(sprintf))(char *__restrict__, const char *__restrict__, ...) = sprintf;