fixed displaying invalid panel values when finishing a game

fixed displaying invalid panel values when finishing a game

This change fixes a graphical bug that occurs when the player solves a
game by entering the exit. During that last movement, the level time
in the game panel is displayed incorrectly as zero, because the final
game values for time, score etc. are calculated not before the player
has completed the last step (while the panel values are displayed from
different variables in the last stage after winning a game).

This is a fix for commit ef1162b3.