Standardize names of params in widget constructors that come from the same enum

[codingiswhyicry]

(This is my fault sorry) - sometimes across constructors of widgets, named parameters will have different names even when they collect the same type of enum. This leads to developer confusion, and is a small thing that just improves readability and more.

Instead of:
SmolTextButtonElement(decorationVariant: decorationPriority.standard);
PrimaryIconButtonElement(variation: decorationPriority.standard);
StandardButtonElement(decor: decorationPriority.standard);

Have it be:
SmolTextButtonElement(decorationVariant: decorationPriority.standard);
PrimaryIconButtonElement(decorationVariant: decorationPriority.standard);
StandardButtonElement(decorationVariant: decorationPriority.standard);

[codingiswhyicry]

Adding top priority tag to this, as param name changes will be a breaking change. So, let's fix this prior to solidifying Aureus as out of beta.