Remove singular workspaces check

Singular workspaces check introduced in #25 no longer necessary,
as mm_workspace setting is automatically dropped into an array

This check causes the workspaces array to be put in a new array, 
meaning the fs.existsSync call fails, as it's being passed an array
instead of the workspace path. This means it always tells me I
have no projects! D: As such, have removed the check and 
adjustment

Hopefully this isn't any issue that's just peculiar to my install :D