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/if_ruby.c b/src/if_ruby.c
index 6773a2a..2480ee4 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -1442,7 +1442,7 @@
 
 	if (u_savedel(n, 1) == OK)
 	{
-	    ml_delete(n, 0);
+	    ml_delete(n);
 
 	    // Changes to non-active buffers should properly refresh
 	    //   SegPhault - 01/09/05