(MODULES-7838) Windows task contains typo which causes failure.

[davejohnston]

The command should be $PSBoundParameters not $SBoundParameters.
This adds back the missing 'P'

Testing

Use bolt to verify the task works as expected.

1. Create a Windows Machine
2. Use Bolt to execute the task

bolt task run bootstrap::windows --modulepath /task-modules --params '{ "master" : "my.puppet.master.com" }' --transport winrm -u Admin -p ***** --no-ssl --no-ssl-verify -n <windows IP>

3. Verify that the puppet agent has been installed on the target host.