Fix route key mismatch in conditional-routing.py workflow example

[AAliKKhan]

The route_weekend function yields route names ("cheap_ideas", "fancy_ideas") that don't exist in the edges dictionary (only "value_ideas" and "premium_ideas" are defined). This causes a runtime failure when the workflow tries to resolve the unknown
route keys.
Changed the routes to match the edges: cheap_ideas→value_ideas, fancy_ideas→premium_ideas.

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[AAliKKhan]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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i have signed the agreement

[joefernandez]

Thanks for the fix!