woops forgot to include import

Author: Trinsdar

src/main/java/org/gtreimagined/gt4r/blockentity/multi/BlockEntityReactorCore.java

@@ -34,6 +34,7 @@
 import net.minecraft.world.level.Explosion.BlockInteraction;
 import net.minecraft.world.level.Level;
 import net.minecraft.world.level.block.Blocks;
+import net.minecraft.world.level.block.LiquidBlock;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.phys.AABB;
 import net.minecraftforge.fluids.FluidStack;