Webapp Manifest icons are generated with invalid paths

[Splaktar]

1. Mac OS-X El Capitan
2. Versions.
   angular-cli: 1.0.0-beta.6
   node: 4.4.3
   os: darwin x64
3. Repro steps.
   ng new myApp --mobile
4. The log given by the failure.
   N/A.
5. Mention any other details that might be useful.
   The icon section of the manifest currently generated by the angular-cli looks like this:

  "icons": [
    {
            "src": "/android-chrome-36x36.png",
            "sizes": "36x36",
            "type": "image/png",
            "density": 0.75
        },
        {
            "src": "/android-chrome-48x48.png",
            "sizes": "48x48",
            "type": "image/png",
            "density": 1
        },
        {
            "src": "/android-chrome-72x72.png",
            "sizes": "72x72",
            "type": "image/png",
            "density": 1.5
        },
        {
            "src": "/android-chrome-96x96.png",
            "sizes": "96x96",
            "type": "image/png",
            "density": 2
        },
        {
            "src": "/android-chrome-144x144.png",
            "sizes": "144x144",
            "type": "image/png",
            "density": 3
        },
        {
            "src": "/android-chrome-192x192.png",
            "sizes": "192x192",
            "type": "image/png",
            "density": 4
        }
  ],

This doesn't work since the icons are bundled into dist/icons and not just in dist/. To fix this, it needs to define the icon src like this:

   "icons": [
    {
            "src": "icons/android-chrome-36x36.png",
            "sizes": "36x36",
            "type": "image/png"
        },
        {
            "src": "icons/android-chrome-48x48.png",
            "sizes": "48x48",
            "type": "image/png"
        },
        {
            "src": "icons/android-chrome-72x72.png",
            "sizes": "72x72",
            "type": "image/png"
        },
        {
            "src": "icons/android-chrome-96x96.png",
            "sizes": "96x96",
            "type": "image/png"
        },
        {
            "src": "icons/android-chrome-144x144.png",
            "sizes": "144x144",
            "type": "image/png"
        },
        {
            "src": "icons/android-chrome-192x192.png",
            "sizes": "192x192",
            "type": "image/png"
        }
  ],

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