Record Attack ghosts scale fix

This fixes how changes to the player's scale are recorded in Record Attack demos, so ghosts of your demos don't disappear when they attempt to change to scales >= FRACUNIT (if they didn't change scales at all they were unaffected).

Have some gifs for comparison:

• A demo recorded without the fix: https://dl.dropboxusercontent.com/s/tk9x8nptzhw7yb1/srb20106.gif
• A demo recorded with the fix: https://dl.dropboxusercontent.com/s/b4h4iuiwbh0voos/srb20107.gif