remove snapshot test for default error

[simonpcouch]

I'm not sure these test anything of interest to us:

parsnip/tests/testthat/_snaps/linear_reg.md

Lines 45 to 65 in 4562458

	Code
	translate(linear_reg(formula = y ~ x))
	Condition
	Error in `linear_reg()`:
	! unused argument (formula = y ~ x)
	---
	Code
	translate(linear_reg(x = hpc[, 1:3], y = hpc$class) %>% set_engine("glmnet"))
	Condition
	Error in `linear_reg()`:
	! unused arguments (x = hpc[, 1:3], y = hpc$class)
	---
	Code
	translate(linear_reg(formula = y ~ x) %>% set_engine("lm"))
	Condition
	Error in `linear_reg()`:
	! unused argument (formula = y ~ x)

Noticed this in the transition to snapshot testing in #1190.

[simonpcouch]

Closing in favor of the linked issue.

[github-actions]

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