Update `read_payroll()` function (again!) to reflect changes by the ABS

[MattCowgill]

Total wages series is no longer part of this release.

[codecov[bot]]

Codecov Report

Patch coverage: 91.66% and project coverage change: +2.93% :tada:

Comparison is base (e5f9905) 88.79% compared to head (46e357f) 91.72%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #237 +/- ## ========================================== + Coverage 88.79% 91.72% +2.93% ========================================== Files 29 29 Lines 1258 1257 -1 ========================================== + Hits 1117 1153 +36 + Misses 141 104 -37 ``` | [Files Changed](https://app.codecov.io/gh/MattCowgill/readabs/pull/237?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matt+Cowgill) | Coverage Δ | | |---|---|---| | [R/read\_payrolls.R](https://app.codecov.io/gh/MattCowgill/readabs/pull/237?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matt+Cowgill#diff-Ui9yZWFkX3BheXJvbGxzLlI=) | `92.74% <91.66%> (+28.74%)` | :arrow_up: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/MattCowgill/readabs/pull/237/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Matt+Cowgill)

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