patch 8.2.0853: ml_delete() often called with FALSE argument

Problem:    ml_delete() often called with FALSE argument.
Solution:   Use ml_delete_flags(x, ML_DEL_MESSAGE) when argument is TRUE.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index a4db3c8..7b53e6c 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -6557,7 +6557,7 @@
 		    lnum = 1;
 		if (*ml_get(lnum) == NUL && u_savedel(lnum, 1L) == OK)
 		{
-		    ml_delete(lnum, FALSE);
+		    ml_delete(lnum);
 		    if (curwin->w_cursor.lnum > 1
 					     && curwin->w_cursor.lnum >= lnum)
 			--curwin->w_cursor.lnum;