test_levels: Add dummies for map06, map11, map15, map20, map31.

Mainly for testing story text.  Map15 and map31 also have a secret
level exit switch next to the main exit switch.
This commit is contained in:
Mike Swanson 2017-02-09 16:34:16 -08:00
parent a8dc4630d7
commit 4757a05ebd

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