Fix typo in the default configuration of the trigger hotkeys.
Fix typo in the default configuration of the trigger hotkeys.

According to setup/keyboardshortcut.py, "Control" seems to be correct.

BUG=none
TEST=compile ibus with --enable-memconf, start ibus-daemon, start ibus-setup, click "..." button for the "Enable or disable" hotkey, then verify that the "Control" checkbox in the pop-up dialog is checked from the beginning.

Review URL: http://codereview.appspot.com/4017042

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