Fix the inputKeyboardLayout type to bool

Switch the type of inputKeyboardLayout attribute from string to bool as the spec SystemInfo API(https://developer.tizen.org/dev-guide/2.2.1/org.tizen.web.device.apireference/tizen/systeminfo.html#::SystemInfo::SystemInfoDeviceCapability) required.

BUG = XWALK-2409
Is <code>s</code> possible string "0"? it means false, but your code will return true.