[sylpheed:34966] Small useability issue: setting key bindings

[Dennis Nezic]

In
  Configuration > Common Preferences > Details > Set key bindings

If you try changing the keyboard bindings to a non-Default setting,
even though you press "OK" to confirm your selection, the dropdown list
continues to display "Default" -- even though internally it knows what
you've selected. But the user probably thinks that he's being
ignored :p... and maybe he won't press "Accept [changes]" afterwards,
because he doesn't think anything has changed.

Even if you try reopening the "Set key bindings" list afterwards, even
if your changes were applied, it will still show "Default" ... but it
should probably show the bindings you're currently using?