Delta Encoding is not used when dictionary enabled

Current code doesn't enable using both Delta Encoding and Dictionary Encoding. If I instantiate ParquetWriter like this :
```Java
val writer = new ParquetWriter[Group](outFile, new GroupWriteSupport, codec, blockSize, pageSize, dictPageSize, enableDictionary = true, true, ParquetProperties.WriterVersion.PARQUET_2_0, configuration)
```

Then this piece of code :
https://github.com/apache/parquet-mr/blob/master/parquet-column/src/main/java/org/apache/parquet/column/values/factory/DefaultValuesWriterFactory.java#L78-L86

Causes that DictionaryValuesWriter is used instead of the inferred DeltaLongEncodingWriter.

The original issue is here : https://github.com/apache/parquet-mr/pull/154#issuecomment-266489768

**Reporter**: [Jakub Liska](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=l154k)

_{**Note**: *This issue was originally created as [PARQUET-796](https://issues.apache.org/jira/browse/PARQUET-796). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Start in parquet-column/src/main/java/org/apache/parquet/column/values/factory/DefaultValuesWriterFactory.java at lines 78-86, then trace how DictionaryValuesWriter is selected instead of the inferred DeltaLongEncodingWriter. Reproduce the ParquetWriter configuration from the issue and add coverage showing the expected encoding behavior when dictionary encoding is enabled.

Written by the indexing model from the issue text.