fix double slabs not dropping items (#2041)

src/main/java/gregtech/common/blocks/wood/BlockGregWoodSlab.java

@@ -2,6 +2,7 @@
 
 import gregtech.api.GregTechAPI;
 import gregtech.api.items.toolitem.ToolClasses;
+import gregtech.common.blocks.MetaBlocks;
 import net.minecraft.block.BlockSlab;
 import net.minecraft.block.SoundType;
 import net.minecraft.block.material.Material;
@@ -10,13 +11,15 @@
 import net.minecraft.block.state.BlockStateContainer;
 import net.minecraft.block.state.IBlockState;
 import net.minecraft.creativetab.CreativeTabs;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.EnumFacing;
 import net.minecraft.util.NonNullList;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.IBlockAccess;
 
 import javax.annotation.Nonnull;
+import java.util.Random;
 
 public abstract class BlockGregWoodSlab extends BlockSlab {
 
@@ -44,6 +47,12 @@ public int damageDropped(IBlockState state) {
         return state.getValue(VARIANT).ordinal();
     }
 
+    @Nonnull
+    @Override
+    public Item getItemDropped(@Nonnull IBlockState state, @Nonnull Random rand, int fortune) {
+        return Item.getItemFromBlock(MetaBlocks.WOOD_SLAB);
+    }
+
     @Nonnull
     @Override
     public String getTranslationKey(int meta) {