Simplify logic

Author: Zorbatron

src/main/java/gregtech/common/metatileentities/storage/MetaTileEntityCreativeTank.java

@@ -129,11 +129,7 @@ public void update() {
             if (fluidHandler == null || fluidHandler.getTankProperties().length == 0)
                 return;
 
-            FluidStack stack = fluidTank.getFluid();
-            int canInsertAmount = fluidHandler.fill(stack, false);
-            stack.amount = Math.min(mBPerCycle, canInsertAmount);
-
-            fluidHandler.fill(stack, true);
+            fluidHandler.fill(fluidTank.drain(mBPerCycle, false), true);
         }
     }
 
@@ -231,17 +227,5 @@ public FluidStack drain(int maxDrain, boolean doDrain) {
         public int fill(FluidStack resource, boolean doFill) {
             return 0;
         }
-
-        @Override
-        public FluidStack getFluid() {
-            FluidStack fluid = super.getFluid();
-
-            if (fluid != null) {
-                fluid = fluid.copy();
-                fluid.amount = mBPerCycle;
-            }
-
-            return fluid;
-        }
     }
 }