Fix mock.withArgs using matchers

[mantoni]

Purpose (TL;DR) - mandatory

Fixes #1960

Background (Problem in detail) - optional

The deepEqual semantics in @sinonjs/samsam have changed in v3 to be (actual, expected) instead of (expected, actual). There was a call left unchanged since no test case existed for this case.

How to verify - mandatory

1. Check out this branch
2. npm install
3. npm t

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[coveralls]

Pull Request Test Coverage Report for Build 2778

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.522%

---

Totals
Change from base Build 2775:	0.0%
Covered Lines:	1663
Relevant Lines:	1729

---

💛 - Coveralls

[dueyfx]

@mantoni Thanks for the quick fix!