Invert ternary operator in auro-input to improve code readability

[sourcery-ai]

The current implementation of the ternary operator in the auro-input component uses a negated condition, which can be difficult to read. It is recommended to invert the ternary operator to improve code readability. The suggested change is to modify the ternary operator as follows:

return this.placeholder ? this.placeholder : 'MM/YYYY';

This change will remove the negation and make the code more straightforward. This issue was identified by the Sourcery AI bot, and while it was noted in a pull request, it was deemed out of scope for the current ticket. Therefore, this issue is being tracked separately to ensure it is addressed.

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I created this issue for @chrisfalaska from #16 (comment).

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