My wife's closet/dressing room has a switch/outlet combination unit on the wall. Today I decided to replace the current unit with a GFCI outlet/switch unit. Upon turning off the power and removing the old switch I became confused. There is only one standard 3 wire romex line running into the box. Looking at the picture of the old switch below, the white wire was connected to the top left terminal, the black wire was connected to the terminal directly below the white one, and the bare wire (ground) was connected to the terminal by itself at the bottom right. I'm really confused what the original electrician did here. I'm also including a picture of the back of the new switch, so if you can provide some suggestions on how to wire it I would be eternally grateful.