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GH-36787: [R] lintr update leads to failing tests on main (#36788)

### What changes are included in this PR?

Turning off the newly introduced indentation linter as it causes test failures, and isn't in sync with styler which we use to style our code.

### Are these changes tested?

No, is linter config.

### Are there any user-facing changes?

No
* Closes: #36787

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Nic Crane <thisisnic@gmail.com>