fix: sourceSets dir fallback

[volodymyr-chekyrta]

This PR introduces a fallback for the sourceSets directory.
This fallback is aimed at fixing an issue with the Tutor build.

Config:

THEME_DIRECTORY: "openedx"

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[HamzaIsrar12]

@volodymyr-chekyrta A better solution would be to introduce a new flag with the default value openedx and base the resources on that, instead of relying on the platformName. Thoughts?

[volodymyr-chekyrta]

@volodymyr-chekyrta A better solution would be to introduce a new flag with the default value openedx and base the resources on that, instead of relying on the platformName. Thoughts?

@HamzaIsrar12, I was thinking about this option too.
I've updated the approach to the feature flag ✅

[HamzaIsrar12]

I would prefer THEME_DIRECTORY because it covers fonts, drawables, views etc

[volodymyr-chekyrta]

I would prefer THEME_DIRECTORY because it covers fonts, drawables, views etc

Makes sense 👍
Updated ✅

[HamzaIsrar12]

LGTM. Thank you for this much-needed PR! 😄

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