Include line numbers in included partials when profiling

Realized in the original Profiling work that line numbers were not being
calculated for any template parsed and rendered via {% include %}. This
commit fixes that oversight.
Unfortunately no, as Profiler.profiling? doesn't get set until `Template#render`, and this method is called during `Template#parse`. That said, this could be changed such that `Profiler.profiling?` does get set earlier. I don't think there would be any issues with that.