tour: no deterministic note as 1.20 does rand seed

[crisman]

With go 1.20 "math/rand package now automatically seeds the global random number generator" (https://go.dev/doc/go1.20#math/rand) and we do not need the appengine specific note that the Go Playground environment for the tour programs is deterministic.

As the note is specific to the appengine version (i.e. it is already not shown in the Go offline tour) it should be fine to just remove the text.

Fixes golang/tour#1448

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