Add explicit ReturnType cast to operator() of FbTk::Slots

without this it wasn't possible to construct a Slot returning void from functors returning some
real value because the compiler would complain about "return statement with a value in a function
returning void".

Theoretically, this may produce some unexpected type conversions, because static_cast is slightly
stronger than implicit cast, but I judge the risk to be negligable (the alternative would be to
provide explicit specializations for slots returning void - too much typing)

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