fix(user.delete): fix vatesfr/xo-web#901.

src/xo-mixins/authentication.js

@@ -175,7 +175,7 @@ export default class {
     return token
   }
 
-  async _getAuthenticationTokensForUser (userId) {
+  async getAuthenticationTokensForUser (userId) {
     return this._tokens.get({ user_id: userId })
   }
 }

src/xo-mixins/subjects.js

@@ -86,7 +86,7 @@ export default class {
     await this._users.remove(id)
 
     // Remove tokens of user.
-    this._xo._getAuthenticationTokensForUser(id)
+    this._xo.getAuthenticationTokensForUser(id)
       .then(tokens => {
         forEach(tokens, token => {
           this._xo._tokens.remove(token.id)