Fix selection boxes not being shown

getSelectedBoundingBox expects a bounding box relative to (0, 0, 0) but
we were returning one relative to the current block. Instead we allow
the default behaviour to continue, which will call getBoundingBox and
offset it.

src/main/java/dan200/computercraft/shared/common/BlockGeneric.java

@@ -218,12 +218,6 @@ public final AxisAlignedBB getBoundingBox( IBlockState state, IBlockAccess world
         return FULL_BLOCK_AABB;
     }
 
-    @Override
-    public final AxisAlignedBB getSelectedBoundingBox( IBlockState state, World world, BlockPos pos )
-    {
-        return getBoundingBox( state, world, pos );
-    }
-
     @Override
     public final AxisAlignedBB getCollisionBoundingBox( IBlockState state, World world, BlockPos pos )
     {