Fix shop issues with category filtering

[Pablete1234]

Fixes bugs regarding filtering categories in the shop:

• Categories with filters would cause index out of bounds exceptions
• When the categories change due to filters, they get updated instead of keeping the same list until re-opening
• Paginated Categories now properly highlight when going back and forth between pages

[cswhite2000]

nit: Assuming we don't need to run category.changed() for every category every time:

Suggested change

	boolean anyChanged = false;
	for (CategoryItem category : allCategories) {
	if (category.changed()) anyChanged = true;
	}
	if (categories != null && !anyChanged) return false;
	if (categories != null && allCategories.stream().noneMatch((CategoryItem::changed)))
	return false;

[Pablete1234]

We do need to check all of them, since that will update the active flag on the category.

If we do a noneMatch as soon as one is changed, all following ones will not get their filter updated.

For most cases, you'll check changed on all categories and none will have changed, in which case that's where it ends. In the odd case that one or more have changed, you will need to re-build the lists etc