Make 'Restart Signal' actually restart Signal

Previously it would just reload the page.

// FREEBIE

js/views/inbox_view.js

@@ -177,7 +177,7 @@
             'click .showSettings': 'showSettings',
             'select .gutter .conversation-list-item': 'openConversation',
             'input input.search': 'filterContacts',
-            'click .restart-signal': 'reloadBackgroundPage',
+            'click .restart-signal': window.restart,
             'show .lightbox': 'showLightbox',
             'click .migrate': 'confirmMigration'
         },

main.js

@@ -212,3 +212,7 @@ ipc.on('draw-attention', function(event, count) {
     }, 1000);
   }
 });
+ipc.on('restart', function(event) {
+  app.relaunch();
+  app.quit();
+});

preload.js

@@ -19,6 +19,10 @@
     console.log('show window');
     ipc.send('show-window');
   };
+  window.restart = function() {
+    console.log('restart');
+    ipc.send('restart');
+  };
   /**
   * Enables spell-checking and the right-click context menu in text editors.
   * Electron (`webFrame.setSpellCheckProvider`) only underlines misspelled words;