Update instancing pipeline uniforms alongside displace uniforms

[printer83mph]

Right now, node uniform updates only trigger displace pipeline updates.

The below commented out code could do this. It currently does not have a function to point to. We could either A) create a matching uniform update method for instancing pipeline(s), or B) replace the current setDisplacePipelineUniform method with a universal setUniform method, setting the value for all of the TerrainRenderer's pipelines.

TerrainGen/src/components/editor/index.tsx

Line 36 in 9b09cff

// terrainRendererRef.current?.setInstancingPipelineUniform(key, value);

Updated:

TerrainGen/src/hooks/use-pipelines.ts

Line 32 in 8ab0c14

terrainRendererRef.current?.setDisplacePipelineUniform(key, value);