fix(bug): allow "complex" filter with update statement

[bunnylushington]

I ran into an issue where the following query failed:

db(:table)
|> filter(:col, in: [1, 2, 3])
|> update(other_col: "new value")

It seems like Moebius.Query.update was doing some re-arranging of parameters and placeholders but did not take into account the in (or other compound constructs). I removed that code and tweaked the remaining code to appropriately start the parameter numbers at the (seemingly) correct value.

The existing tests pass with some re-work. To ensure that my test assumptions were correct, I also added a couple of assertions to ensure the parameter list is in the correct order. While my changes do not adversely affect my code, I'm more than happy to consider a different approach if this is not sufficient.

Thanks for providing the library; it's proving extremely useful.

[cpursley]

Thank you @bunnylushington! Can you review the failing tests around code formatting?

[bunnylushington]

No problem at all. Sorry I missed that before creating the PR.