Update WGet.java - get rid of double forward url ending slash

Without the patch, the configuration:
<url>http://localhost:8080/service/persons?wsdl</url>
results in an attempt of downloading the file with double forward slash at the end of the 'repoURL':
Downloading: http://localhost:8080/service//persons?wsdl

With the patch the double forward slash is removed:
Downloading: http://localhost:8080/service/persons?wsdl