Fix to version check

This is only used in determining the most recent version a dataset is in
on the file page, e.g. for https://demo.dataverse.org/file.xhtml
?persistentId=doi:10.70122/FK2/FO0MPQ/KNG6PA&version=3.0

I confirmed that demo shows version 1 in this example whereas it should
show version 2 (which this commit fixes).

src/main/java/edu/harvard/iq/dataverse/DataFileServiceBean.java

@@ -384,7 +384,8 @@ public FileMetadata findMostRecentVersionFileIsIn(DataFile file) {
         if (fileMetadatas == null || fileMetadatas.isEmpty()) {
             return null;
         } else {
-            return fileMetadatas.get(0);
+            // This assumes the order of filemetadatas is from first to most recent, which is true as of v6.3 
+            return fileMetadatas.get(fileMetadatas.size() - 1);
         }
     }