Updating either dependency or maintainer splits to 0% on a project results in invalid TX

[efstajas]

Repro:

1. Have a project that has both dependency & maintainer splits
2. Click Edit splits
3. Set high-level percentage of either dependencies or maintainers to 0%
4. Complete the flow and click create transaction
5. Observe transaction fails to simulate because it tries to set split receiver(s) with weight 0

Fix:

• Filter out splits with weight 0 before building the edit splits TX payload