[Android] Fix background image repeat behaviours #2957
Merged
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Fixes #2947
The issue came with the "hackish" trick to avoid containers to grow if a background image was specified even if the background was smaller, there I was adding an empty image of size 1x1 but that overrode the repeat behaviour that was using the actual set background image
Also found out that the incomplete images were not being drawn so I fixed that too
How verified
The mobile app was run and this are the results
AdaptiveCard.BackgroundImage.FillMode.json
AdaptiveCard.BackgroundImage.FillMode.Repeat.json
AdaptiveCard.BackgroundImage.FillMode.RepeatHorizontally.json
AdaptiveCard.BackgroundImage.FillMode.RepeatVertically.json
Column.BackgroundImage.json
Container.BackgroundImage.json