Fix oversight in recent pg_basebackup fix causing pg_receivexlog failures.

A oversight in 2c0a485896 causes 'could not create archive status file
"...": No such file or directory' errors in pg_receivexlog if the
target directory doesn't happen to contain a archive_status
directory. That's due to a stupidly left over 'true' constant instead
of mark_done being passed down to ProcessXLogDataMsg().

The bug is only present in the master branch, and luckily wasn't
released.

Spotted by Fujii Masao.

src/bin/pg_basebackup/receivelog.c

@@ -906,7 +906,7 @@ HandleCopyStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,
 			{
 				if (!ProcessXLogDataMsg(conn, copybuf, r, &blockpos,
 										timeline, basedir, stream_stop,
-										partial_suffix, true))
+										partial_suffix, mark_done))
 					goto error;
 
 				/*