remove snapshot test for default error

[simonpcouch]

I'm not sure this tests anything of interest to us:

parsnip/tests/testthat/_snaps/mlp.md

Lines 56 to 68 in 4562458

	Code
	translate(mlp(mode = "classification", x = x, y = y) %>% set_engine("keras"))
	Condition
	Error in `mlp()`:
	! unused arguments (x = x, y = y)
	---
	Code
	translate(mlp(mode = "regression", formula = y ~ x) %>% set_engine())
	Condition
	Error in `mlp()`:
	! unused argument (formula = y ~ x)

[simonpcouch]

Closing in favor of the linked issue.

[github-actions]

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