Well, this (particular one) is easy to do in the image editor.
Open the sprite in the image editor. Window showing the animation frames should pop up too.
Assuming that there is only 1 frame.
Right click that frame .. choose Duplicate. Select that duplicated frame.
Select the Rectangle Tool in the image editor, Right click/drag the first line of pixels away.
Right click that frame in animation window .. choose Duplicate. Select that duplicated frame.
Select the Rectangle Tool, Right click/drag the first line of pixels away.
and so on .....
Reverse the frames.