fix fluid storage bus resetCache spam

[kurrycat2004]

onNeighborChanged gets called when the connected block changes, which happens a lot if you for example have a FluidStorageBus connected to a FluidInterface with stocked fluids.
What will happen before this change using this setup is that every time the FluidStorageBus pulls fluids from the FluidInterface, the FluidInterface will markDirty() which causes an onNeighborChanged of the FluidStorageBus, which in turn will call resetCache(), because its a FluidInterface it is next to.

Now the normal item StorageBus already handles it correctly: comparing the handler hash before the resetCache call, which will correctly skip the resetCache in the described setup.

This PR simply copies the same behaviour 1 to 1 to the FluidStorageBus