Update LastFMRestClient.java file and fix a bug

The integers in some of the languages is not match by android studio for example in Persian language integers is not international and android studio can not identify these integers.

app/src/main/java/code/name/monkey/retromusic/rest/LastFMRestClient.java

@@ -66,7 +66,7 @@ public class LastFMRestClient {
     private static Interceptor createCacheControlInterceptor() {
         return chain -> {
             Request modifiedRequest = chain.request().newBuilder()
-                    .addHeader("Cache-Control", String.format("max-age=%d, max-stale=%d", 31536000, 31536000))
+                    .addHeader("Cache-Control", String.format("max-age=31536000, max-stale=31536000"))
                     .build();
             return chain.proceed(modifiedRequest);
         };