Retire `make_afun()` - Batch 3

[edelarua]

Feature description

Refactor functions listed as batch 3 to no longer use make_afun().

• R/abnormal.R
• R/abnormal_by_baseline.R
• R/abnormal_by_marked.R
• R/abnormal_by_worst_grade.R
• R/abnormal_by_worst_grade_worsen.R

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