feat: remove unneeded null coalescing assignment

axios headers are now alway present (according to the typings)

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2337>

front/src/init/axios.ts

@@ -9,6 +9,7 @@ import moment from 'moment'
 import axios from 'axios'
 
 import useLogger from '~/composables/useLogger'
+import { getDepOptimizationConfig } from 'vite'
 
 const { t } = i18n.global
 const logger = useLogger()
@@ -18,8 +19,7 @@ export const install: InitModule = ({ store, router }) => {
   axios.defaults.xsrfHeaderName = 'X-CSRFToken'
   axios.interceptors.request.use(function (config) {
     // Do something before request is sent
-    if (store.state.auth.oauth.accessToken) {
-      config.headers ??= {}
+    if (store.state.auth.oauth.accesscToken) {
       config.headers.Authorization = store.getters['auth/header']
     }
     return config
@@ -133,7 +133,6 @@ export const install: InitModule = ({ store, router }) => {
       }
 
       if (failedRequest.response) {
-        failedRequest.response.config.headers ??= {}
         failedRequest.response.config.headers.Authorization = store.getters['auth/header']
       }