Code formatting updates for backup.js

.eslintignore

@@ -25,6 +25,7 @@ test/views/*.js
 !js/views/file_input_view.js
 !js/views/inbox_view.js
 !js/views/settings_view.js
+!js/backup.js
 !js/database.js
 !main.js
 !prepare_build.js

Gruntfile.js

@@ -104,6 +104,7 @@ module.exports = function(grunt) {
         '!js/libsignal-protocol-worker.js',
         '!js/components.js',
         '!js/logging.js',
+        '!js/backup.js',
         '!js/modules/**/*.js',
         '!js/views/debug_log_view.js',
         '!js/signal_protocol_store.js',