Typos in template-app package.json

[roryok]

Note the use of "Proton" instead of "Photon"

{ "name": "proton-template-app", "version": "1.0.0", "description": "A simple template app for Proton", "main": "app.js", "author": "Connor Sears", "scripts": { "start": "electron ." } }