fix constrained model run errors

[XueqingYin]

• Summary of changes (Bug fix, feature, docs update, ...)
  To fix the errors when running the constrained model.

1. Put ‘data= simdf_time’ inside the function like( ).
2. Delete ‘marginal = bru_mapper_marginal(qexp, rate = 1)’, ‘group_mapper = bru_mapper(mesh)’, and ‘qexp <- stats::qnorm(p, mean = 0, sd = 1, lower.tail = TRUE, log.p = FALSE)’ simply because they keep reporting errors.

• Please check if the PR fulfills these requirements

• Closes #xxxx (replace xxxx with the GitHub issue number)
• Tests added and passed
• All code checks passing - styler run over code
• Vignettes updated/added
• Added an entry in the latest CHANGELOG.md file if fixing a bug or adding a new feature
• Any new libraries added to DESCRIPTION

[gareth-j]

Thanks!