Update ExcelBinaryReader.cs

 XLS (97-2003) files created with LibreOffice or OpenOffice would have their first row skipped when IsFirstRowAsColumnNames was set to false, but would read the first row correctly when set to true. Not sure if this will affect anything else in this project.

This is a fix for the issue posted on CodePlex.
https://exceldatareader.codeplex.com/workitem/12647