bug in bounding_box.from_dimensions

### Description

bounding_box.from_dimensions returns the same values for left_top and right bottom

`player.print(serpent.block(flib_bounding_box.from_dimensions({ x = 0, y = 0 },10,10)))`

returns

`{
  left_top = {
    x = -5,
    y = -5
  },
  right_bottom = {
    x = -5,
    y = -5
  }
}`

flib_area.from_dimensions gives the correct answer

### Reproduction

_No response_