Remove remaining unary plusses

[billdenney]

.by <- "Part"

formulops::modify_formula(
  AVAL ~ ACTTIME | Part + Treatment + Subject,
  lapply(X = .by, FUN = as.name),
  replace = rep(list(NULL), length(.by))
)
#> AVAL ~ ACTTIME | +Treatment + Subject

^{Created on 2024-01-22 with reprex v2.0.2}