Fix inconsistent use of var ints in fluid packets

src/codechicken/lib/data/MCDataOutputWrapper.java

@@ -233,7 +233,7 @@ public class MCDataOutputWrapper implements MCDataOutput
             writeShort(-1);
         } else {
             writeShort(fluid.fluidID);
-            writeInt(fluid.amount);
+            writeVarInt(fluid.amount);
             writeNBTTagCompound(fluid.tag);
         }
         return this;

src/codechicken/lib/packet/PacketCustom.java

@@ -465,7 +465,7 @@ public final class PacketCustom implements MCDataInput, MCDataOutput
         short fluidID = readShort();
 
         if (fluidID >= 0)
-            fluid = new FluidStack(fluidID, readInt(), readNBTTagCompound());
+            fluid = new FluidStack(fluidID, readVarInt(), readNBTTagCompound());
 
         return fluid;
     }