Fixing a few style warnings from jscs

Fixing a few warnings from `$ grunt jscs`. Now down to 5 warnings.

```
$ grunt jscs
Running "jscs:src" (jscs) task

If statement without curly braces at app/scripts/lib/channels/fx-desktop.js :
    48 |    /*jshint validthis: true*/
    49 |    var result = event.data.content;
    50 |    if (! result) return;
------------^
    51 |
    52 |    var type = event.data.type;

If statement without curly braces at app/scripts/lib/channels/fx-desktop.js :
    68 |  function findInitialPage() {
    69 |    this.send('session_status', {}, _.bind(function(err, response) {
    70 |      if (err) return;
--------------^
    71 |
    72 |      if (response.data) {

Keyword `else` should not be placed on new line at app/scripts/lib/channels/fx-desktop.js :
    74 |        this.router.navigate('settings', { trigger: true });
    75 |      }
    76 |      else {
--------------^
    77 |        delete Session.email;
    78 |        this.router.navigate('signup', { trigger: true });

Line must be at most 160 characters at app/scripts/router.js :
    26 |  'transit'
    27 |],
    28 |function ($, Backbone, IntroView, SignInView, SignUpView, ConfirmView, SettingsView, TosView, PpView, AgeView, BirthdayView, CreateAccountView, CannotCreateAccountView, CompleteSignUpView, ResetPasswordView, ConfirmResetPasswordView, CompleteResetPasswordView, ResetPasswordCompleteView) {
--------^
    29 |  var Router = Backbone.Router.extend({
    30 |    routes: {

If statement without curly braces at app/tests/spec/lib/channels/fx-desktop.js :
    47 |
    48 |    afterEach(function() {
    49 |      if (channel) channel.teardown();
--------------^
    50 |    });
    51 |

>> 5 code style errors found!
Warning: Task "jscs:src" failed. Use --force to continue.

Aborted due to warnings.
```