patch 8.0.1135: W_WINCOL() is always the same

Problem:    W_WINCOL() is always the same.
Solution:   Expand the macro.
diff --git a/src/window.c b/src/window.c
index 370f749..ca56d9c 100644
--- a/src/window.c
+++ b/src/window.c
@@ -2724,7 +2724,7 @@
     if (frp2 == frp_close->fr_next)
     {
 	int row = win->w_winrow;
-	int col = W_WINCOL(win);
+	int col = win->w_wincol;
 
 	frame_comp_pos(frp2, &row, &col);
     }