move helpers out of tabs directory

src/components/settings_modal/tabs/filtering_tab.js

 import { filter, trim } from 'lodash'
 import Checkbox from 'src/components/checkbox/checkbox.vue'
 
-import SharedComputedObject from './helpers/shared_computed_object.js'
+import SharedComputedObject from '../helpers/shared_computed_object.js'
 
 const FilteringTab = {
   data () {

src/components/settings_modal/tabs/general_tab.js

 import Checkbox from 'src/components/checkbox/checkbox.vue'
 import InterfaceLanguageSwitcher from 'src/components/interface_language_switcher/interface_language_switcher.vue'
 
-import SharedComputedObject from './helpers/shared_computed_object.js'
+import SharedComputedObject from '../helpers/shared_computed_object.js'
 
 const GeneralTab = {
   data () {