fix: omit deprecated oc_requesttoken

custom.d.ts

@@ -1,7 +1,8 @@
 declare var OC: {
     generateUrl(string, any?): string,
     PasswordConfirmation: any,
-    getCurrentUser(): {uid: string, displayName: string}
+    getCurrentUser(): {uid: string, displayName: string},
+    requestToken: string,
 };
 declare var oc_requesttoken: string;
 declare var JSXC: any;

ts/DefaultAvatar.ts

@@ -101,7 +101,7 @@ function getAvatarUrl(username: string, size: number) {
    return OC.generateUrl('/avatar/' + encodeURIComponent(username) + '/' + size, {
       user: username,
       size,
-      requesttoken: oc_requesttoken
+      requesttoken: OC.requestToken || oc_requesttoken
    });
 }