Rename ssl_debug_helpers.h

It's no longer generated, so rename it accordingly.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 31d7daf..dcf1ff8 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -34,7 +34,7 @@
 #include "ssl_misc.h"
 #include "ecdh_misc.h"
 #include "ssl_tls13_keys.h"
-#include "ssl_debug_helpers_generated.h"
+#include "ssl_debug_helpers.h"
 
 /* Write extensions */