fix GrS integration with fluid machines (WARNING below)

[Wizzerinus]

Warning: I did not test whether the repo still compiles and such because the repo just wouldn't compile for me due to missing classes

This PR fixes the issue where adding a new input fluid to a machine such as Fluid Enricher through a Groovyscript recipe does not allow that fluid to enter the machine (This script is an example of what I mean)

This mixin in my mod fixes the issue so I just copied the fix in. Again didn't actually test it in this environment. Sorry 🥺