Correctly show the wslu version with wslsys -v instead of wslu v

[crramirez]

Description

When you issue a wslsys -v it shows wslu v instead of the actual version. This is a variable typo and was solved by calling the right one.

Please add the hacktoberfest-acceptedlabel

Types of changes

Breaking change (fix or feature that would cause existing functionality to not work as expected) are no longer accepted

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist:

• I have read Code of Conduct and Contributing documentations.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.