fix(prepare): delete splash screens if none are used #1227
Merged
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Motivation and Context
We copy default splash screens to the platform folder during platform creation. But then we do not delete them when the user uses no splash screens at all. This causes #1226 and what is described in #689.
Fixes #1226
Description
The new implementation does not return early when updating splashes and none are defined. Instead, we let the cleanup map we create initially take care of deleting all unused splash screens. This also deletes the default splashes during the first prepare after platform creation.
Testing
Manual testing on a default app.
A regression test would be great but I'm on a tight schedule. Feel free to add one if you feel like it.
Checklist