PAINTROID-504 Fix CatrobatImageIOIntegrationTests

[khalid-nasralla]

PAINTROID-504

The problem was that the test assumed that the overwrite view will pop up but it won't happen because before the test, there shouldn't be the same file already on jenkins, so there won't be a pop up asking if you want to overwrite. It just saves it and is done.
File also gets cleaned up now after executing the test.

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[Lenkomotive]

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