Remove default baseline from module manifest

[BernieWhite]

Issue #809 implements configuring default baseline in module configuration.

This issue removes support for module manifest configuration.

@{
  # Private data to pass to the module specified in RootModule/ModuleToProcess. This may also contain a PSData hashtable with additional module metadata used by PowerShell.
  PrivateData = @{
      PSData = @{
          # Tags applied to this module. These help with module discovery in online galleries.
          Tags = @('PSRule-rules')
      }
      PSRule = @{
          Baseline = 'Enterprise.Default'
      }
  }
}