Change set_use_system_keyboard_layout() timing.
Change set_use_system_keyboard_layout() timing.

Call set_use_system_keyboard_layout() before update_engines() is called
in panel.vala because update_engines() calls switch_engine().

BUG=http://code.google.com/p/ibus/issues/detail?id=1558#c43

Review URL: https://codereview.appspot.com/7559043

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