CLN: Remove unused param
Param no longer used. Can remove it from single caller of this function
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=h1) Report
> Merging [#22323](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/601d71fcfa9081fa88e5c20148972cd766396cd7?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `100%`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/22323/graphs/tree.svg?height=150&width=650&src=pr&token=eZ4WkYLtcO)](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #22323   +/-   ##
=======================================
  Coverage   92.08%   92.08%           
=======================================
  Files         169      169           
  Lines       50706    50706           
=======================================
  Hits        46691    46691           
  Misses       4015     4015
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.49% <100%> (ø)` | :arrow_up: |
| #single | `42.33% <50%> (ø)` | :arrow_up: |

| [Impacted Files](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=tree) | Coverage Δ | |
|---|---|---|
| [pandas/core/indexes/base.py](https://codecov.io/gh/pandas-dev/pandas/pull/22323/diff?src=pr&el=tree#diff-cGFuZGFzL2NvcmUvaW5kZXhlcy9iYXNlLnB5) | `96.43% <100%> (ø)` | :arrow_up: |

------

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> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=footer). Last update [601d71f...393992c](https://codecov.io/gh/pandas-dev/pandas/pull/22323?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).
 > so rather than do this, I would make the signature more similar to ....numeric_binop and pass op, then construct the opstr inside.

@jreback I think this is feasible only after merging #22336 and replacing ``np.abs`` with ``operator.abs`` (no idea whether this has any side effect), because ``np.abs.__name__`` is "absolute", not "abs".
 closing as this is dependent on #22336 which needs to be fixed first.