Update DynamicBudgetTable to fill more of the view when viewing fewer months

[jarneson33]

Hello, new to actual and loving the project! That said I was taken aback by the budgets view when only viewing 1-2 months on a high resolution panel. So I am opening this pull request to see if this is something the maintainers would be open to or if this fixed width is a mandatory design choice.

EDIT: Changed from allowing 100% span to just upping the original logic to allow the table to maintain original design but be less floaty island.

Thank you.

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