Bug 1048905 - Copy icon-font into system/fonts/hidden/ on build

please add condition `if (options.BUILD_APP_NAME === '*')` for this command:
```js
    if (options.BUILD_APP_NAME === '*') {
      return sh.run(['-c', adb + ' push ' +
        '"shared/elements/gaia-icons/fonts/gaia-icons.ttf" ' +
        '//system/fonts/hidden/']);
    }
```