cosmetics in wxGUI dialogs (merge https://trac.osgeo.org/grass/changeset/39319 from devbr6)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@39320 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/menuform.py

@@ -763,7 +763,8 @@ class mainFrame(wx.Frame):
         # add help button
         btnsizer.Add(item=self.btn_help, proportion=0, flag=wx.ALL | wx.ALIGN_CENTER, border=10)
 
-        guisizer.Add(item=btnsizer, proportion=0, flag=wx.ALIGN_CENTER)
+        guisizer.Add(item=btnsizer, proportion=0, flag=wx.ALIGN_CENTER | wx.LEFT | wx.RIGHT,
+                     border = 30)
 
         if self.parent is not None:
             self.outputType = None