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/proto/memline.pro b/src/proto/memline.pro
index de11868..364f0aa 100644
--- a/src/proto/memline.pro
+++ b/src/proto/memline.pro
@@ -26,7 +26,7 @@
 int ml_append_buf(buf_T *buf, linenr_T lnum, char_u *line, colnr_T len, int newfile);
 int ml_replace(linenr_T lnum, char_u *line, int copy);
 int ml_replace_len(linenr_T lnum, char_u *line_arg, colnr_T len_arg, int has_props, int copy);
-int ml_delete(linenr_T lnum, int message);
+int ml_delete(linenr_T lnum);
 int ml_delete_flags(linenr_T lnum, int flags);
 void ml_setmarked(linenr_T lnum);
 linenr_T ml_firstmarked(void);