UI: Incorrect Cursor Used in Split Area Operator

Incorrect cursor shown for horizontal split when selected from edge context menu.

Differential Revision: https://developer.blender.org/D6124

Reviewed by Campbell Barton

source/blender/editors/screen/screen_ops.c

@@ -2119,7 +2119,7 @@ static void area_split_preview_update_cursor(bContext *C, wmOperator *op)
 {
   wmWindow *win = CTX_wm_window(C);
   int dir = RNA_enum_get(op->ptr, "direction");
-  WM_cursor_set(win, (dir == 'n' || dir == 's') ? WM_CURSOR_H_SPLIT : WM_CURSOR_V_SPLIT);
+  WM_cursor_set(win, dir == 'h' ? WM_CURSOR_H_SPLIT : WM_CURSOR_V_SPLIT);
 }
 
 /* UI callback, adds new handler */