patch 8.2.2685: custom statusline not drawn correctly with WinBar

Problem:    Custom statusline not drawn correctly with WinBar.
Solution:   Also adjust the column for the custom status line. (Yee Cheng
            Chin, closes #8047)
diff --git a/src/screen.c b/src/screen.c
index d219b13..9d5d4df 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -1248,7 +1248,7 @@
     }
     else
     {
-	row = W_WINROW(wp) + wp->w_height;
+	row = statusline_row(wp);
 	fillchar = fillchar_status(&attr, wp);
 	maxwidth = wp->w_width;