scripts: kconfig: guiconfig: fix ttk.PanedWindow orient

Changed orient=VERTICAL to orient="vertical".
VERTICAL wasn't imported; ttk.Panedwindow expects a string.

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

Author: kartben

guiconfig.py

@@ -495,7 +495,7 @@ def _create_kconfig_tree_and_desc(parent):
     # Panedwindow and the Treeview. This code is shared between the main window
     # and the jump-to dialog.
 
-    panedwindow = ttk.Panedwindow(parent, orient=VERTICAL)
+    panedwindow = ttk.Panedwindow(parent, orient="vertical")
 
     tree_frame, tree = _create_kconfig_tree(panedwindow)
     desc_frame, desc = _create_kconfig_desc(panedwindow)