[TIMOB-17761] Launch images for iPhone 6 and 6+ in i18n not copied

The [titanium-sdk](https://github.com/appcelerator/titanium_mobile/blob/58198c641d77e17d156431666e80bae732b5c130/node_modules/titanium-sdk/lib/i18n.js#L64) module which is part of the SDK needs to be updated for the new iPhone 6 and 6+ launch images. *If this is not changed, localized apps will not have launch images on iPhone 6 and 6+, preventing them from publishing for these devices correctly.* I've created a PR that fixes this and is future proof for other subtypes (h667) and scales (@3x) as well: * master: https://github.com/appcelerator/titanium_mobile/pull/6161 * 3_4_X: https://github.com/appcelerator/titanium_mobile/pull/6166 To test: 1. Create a project 2. Move the launch images from Resources/iphone to i18n/en 3. Add some text to the iPhone 6 and 6+ images in the new folder 3. Build the project 4. Run on iPhone 6 or 6+ and see it is not showing the i18n images