Fix mock in tests

app/soapbox/api/__mocks__/index.ts

@@ -23,7 +23,12 @@ export const getLinks = (response: AxiosResponse): LinkHeader => {
 
 export const getNextLink = (response: AxiosResponse) => {
   const nextLink = new LinkHeader(response.headers?.link);
-  return nextLink.refs.find((ref) => ref.uri)?.uri;
+  return nextLink.refs.find(link => link.rel === 'next')?.uri;
+};
+
+export const getPrevLink = (response: AxiosResponse) => {
+  const prevLink = new LinkHeader(response.headers?.link);
+  return prevLink.refs.find(link => link.rel === 'prev')?.uri;
 };
 
 export const baseClient = (...params: any[]) => {