Tests now need the parameter choicerule

[todo]

the fix for requiring the choicerule breaks some tests in shortfall, e.g.

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cognitivemodels/tests/testthat/test_shortfall.R

Lines 11 to 15 in b360bef

	# @todo Tests now need the parameter choicerule
	# @body the fix for requiring the choicerule breaks some tests in shortfall, e.g.
	M <- shortfall(choice ~ x1 + px + x2 + I(1-px) | y1 + py + y2 + I(1-py), data = dt, asp = ~aspiration, fix = pars)
	tol <- .01

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This issue was generated by todo based on a todo comment in b360bef.

[FlorianSeitz]

ımplemented