Update ServiceRepositoryTrait with missing ManagerRegistry param

[mustanggb]

Using static analysis gives the error:

Expected type 'Doctrine\Persistence\ManagerRegistry'. Found 'Doctrine\ODM\MongoDB\DocumentManager'
@param \Doctrine\ODM\MongoDB\DocumentManager $registry

[mustanggb]

Opened #783 for the unrelated Static Analysis failure.

[malarzm]

@mustanggb thanks for the PR! I've taken care of the fail you've mentioned, thanks for pointing me to a dangling PR. That also made me realize that your PR was targeted at wrong branch, I've changed it to 4.6.x so we'll be able to release that as a bugfix sooner than later.

Would you mind:

• rebsing your branch atop 4.6.x
• squashing your commits
• add a more meaningful commit message? PR's title is a good candidate :)

[mustanggb]

Would you mind:

• rebsing your branch atop 4.6.x
• squashing your commits
• add a more meaningful commit message? PR's title is a good candidate :)

Done.

[malarzm]

Thanks @mustanggb!