Patch for evt::regimen.ii(double) bug

[kylebaron]

mrgsolve 1.4.1

• Fix bug in evt::regimen.ii(double) where timing of next dose was not as expected (#1170).

---

Submitted 1.4.0 to CRAN on Feb 7, 2024. Shortly thereafter, found bug in evt::regimen(double). This PR patches that bug.

See #1170 #1169

scores:
{
  "testing": {
    "check": 0.9,
    "covr": 0.7131
  },
  "documentation": {
    "has_vignettes": 0,
    "has_website": 1,
    "has_news": 1
  },
  "maintenance": {
    "has_maintainer": 1,
    "news_current": 1
  },
  "transparency": {
    "has_source_control": 1,
    "has_bug_reports_url": 1
  }
}