aligned_umap() only returns one value

[shancarter]

Fixing error when trying to unpack return values. The function only returns one value.

[coveralls]

Pull Request Test Coverage Report for Build 536

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 70.492%

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Totals
Change from base Build 535:	0.0%
Covered Lines:	1763
Relevant Lines:	2501

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💛 - Coveralls

[ludwigschubert]

As discussed in person, it's a polymorphic function that can take an iterable of activations, too. I'll see this as feedback against creating such functions, at least not until we have more type hints to help.