Merge pull request #2821 from nextcloud/refresh-folder-operation-vector-replace

operations: Replace use of Vector with a unsynchronized equivalent.

src/main/java/com/owncloud/android/operations/RefreshFolderOperation.java

@@ -360,7 +360,7 @@ public class RefreshFolderOperation extends RemoteOperation {
 
         Log_OC.d(TAG, "Remote folder " + mLocalFolder.getRemotePath() + " changed - starting update of local data ");
 
-        List<OCFile> updatedFiles = new Vector<>(folderAndFiles.size() - 1);
+        List<OCFile> updatedFiles = new ArrayList<>(folderAndFiles.size() - 1);
         mFilesToSyncContents.clear();
 
         // if local folder is encrypted, download fresh metadata