patch 8.0.1143: macros always expand to the same thing

Problem:    Macros always expand to the same thing.
Solution:   Remove W_VSEP_WIDTH() and W_STATUS_HEIGHT().
diff --git a/src/ex_getln.c b/src/ex_getln.c
index becfa00..9f7dad9 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -3438,7 +3438,7 @@
 	cmdline_row = Rows - 1;
     else
 	cmdline_row = W_WINROW(lastwin) + lastwin->w_height
-						   + W_STATUS_HEIGHT(lastwin);
+						    + lastwin->w_status_height;
 }
 
     static void