chore: edit package.json license to match SPDX id
chore: edit package.json license to match SPDX id

See [NPM package.json spec for licenses](https://docs.npmjs.com/files/package.json#license) and [SPDX license IDs](https://spdx.org/licenses/)

X-ref: https://github.com/apache/cordova-plugin-device/pull/48
apache/cordova-plugin-file,purplecabbage/cordova-plugin-file,tripodsan/cordova-plugin-file,sanmeranam/cordova-file,apache/cordova-plugin-file,GenusAS/cordova-plugin-file,mnill/cordova-plugin-file,mnill/cordova-plugin-file,sanmeranam/cordova-file,tripodsan/cordova-plugin-file,sanmeranam/cordova-file,GenusAS/cordova-plugin-file,GenusAS/cordova-plugin-file,mnill/cordova-plugin-file,starquake/cordova-plugin-file,tripodsan/cordova-plugin-file,starquake/cordova-plugin-file,purplecabbage/cordova-plugin-file,sanmeranam/cordova-file,tripodsan/cordova-plugin-file,mnill/cordova-plugin-file,purplecabbage/cordova-plugin-file,purplecabbage/cordova-plugin-file,GenusAS/cordova-plugin-file