Updated the Water test scene as it was forgotten about for a while

Added default references to the Water.cs in the hopes to solve some WaterResources missing when loading the project.

Packages/com.verasl.water-system/Scripts/Water.cs.meta

 MonoImporter:
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   serializedVersion: 2
-  defaultReferences: []
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+  - surfaceData: {fileID: 11400000, guid: 846f3dc3b5341447a86687211f741bc7, type: 2}
+  - resources: {fileID: 11400000, guid: 40615c805d6e84ce7800418367985fe1, type: 2}
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