* TUNIC: Add Shop indirect condition
The `Overworld -> Cube Cave Entrance Region` Entrance checks
`can_shop()` which checks for being able to reach the "Shop" Region, so
the Entrance requires an indirect condition of reaching the "Shop"
Region.
* Rename entrance variable to cube_entrance
Co-authored-by: Scipio Wright <scipiowright@gmail.com>
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Co-authored-by: Scipio Wright <scipiowright@gmail.com>