only dye barrel/crucible when it is a different color

[Dutchs]

In some circumstances (common use-case being automation) you can void dyes if using them on a barrel/crucible that might go from having water to not having water.
A potential fix for this is to only use the dye when it's going to change the block to a different color than it already is.
related issue: DarkPacks/SkyFactory-5#143