Display time taken on result screen for single levels [SUGGESTION]

[Nepster]

If one plays a level pack, the time taken to solve a level is displayed on the result screen. This information is however missing when one plays a single level. I suggest to add it.

[namida]

Makes sense. The current way NL works would not serve well to keeping track of the users records, but the "time taken on latest attempt" could be shown.

[namida]

Simple change, so it's done.