Revert accidental change of WAL_DEBUG default.

Oops.

src/include/pg_config_manual.h

@@ -281,7 +281,7 @@
  * Enable debugging print statements for WAL-related operations; see
  * also the wal_debug GUC var.
  */
-#define WAL_DEBUG
+/* #define WAL_DEBUG */
 
 /*
  * Enable tracing of resource consumption during sort operations;