Strengthen: improve technique to pass results from cTelnet::loadReplay(...)

After both subtle and then some more direct hints from another developer
I (finally!) understood that it was better to past an integer code
separately back from this method in a QPair<T1,T2> form rather than
appending it to the front of the other return value of a QString.

Signed-off-by: Stephen Lyons <slysven@virginmedia.com>