Fix the inputKeyboardLayout type to bool

Switch the inputKeyboardLayout attribute from string type to bool type as the spec SystemInfo API(https://developer.tizen.org/dev-guide/2.2.0/org.tizen.web.device.apireference/tizen/systeminfo.html#::SystemInfo::SystemInfoDeviceCapability) required.
It's done. Thanks to @qjia7 and @halton .