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/popupmenu.c b/src/popupmenu.c
index 2fe4cff..197cdca 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -817,7 +817,7 @@
 		{
 		    // Already a "wipeout" buffer, make it empty.
 		    while (!BUFEMPTY())
-			ml_delete((linenr_T)1, FALSE);
+			ml_delete((linenr_T)1);
 		}
 		else
 		{
@@ -860,7 +860,7 @@
 			}
 		    }
 		    // delete the empty last line
-		    ml_delete(curbuf->b_ml.ml_line_count, FALSE);
+		    ml_delete(curbuf->b_ml.ml_line_count);
 
 		    // Increase the height of the preview window to show the
 		    // text, but no more than 'previewheight' lines.