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fix: CostSum.visualize with a single visualizable component (#1147)

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Split out of #1137.

`plt.subplots(1, 1)` returns a bare Axes, not an array, so indexing it
raised a `TypeError` when the sum contained exactly one component with a
`visualize` method. The fix passes `squeeze=False`.

Also removes the `**kwargs` paragraph from the docstring. The method
does not accept `**kwargs`.

Reported in #1132.

Co-authored-by: Eduardo Rodrigues <eduardo.rodrigues@cern.ch>

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