Get Mojo ignores the transitive attribute because of a typo in the parameter declaration

[Note : "get" is missing as a component for MDEP jira.]

Due to a typo in the GetMojo code, transitive resolution doesn't work. @parameter was set to {$transitive} instead of ${transitive}.

Thanks a lot.
PS : I tried providing the corresponding ITs, but didn't really manage to cope with configuring the (stub) environment. I'm providing the unfinished code anyway, since I think it might be missing not much. Feel free to wipe all ITs I tried to initiate if it's simpler. I think I'll have a look at how you do it, if you find time for that.