Use visible property in place of a loader

[boutinb]

Fixes https://github.com/jasp-stats/INTERNAL-jasp/issues/2423

[Kucharssim]

So this means that ANCOVA and RM ANOVA wrappers in R would receive additional arguments even though they shouldn't, right? Because setting visible to false does not equal not having that argument in the first place

[boutinb]

@Kucharssim You are right... But the default setting is homogeneityCorrectionNone is true and the rest is false, and in the R code I see:

 # Set corrections to FALSE when performing ANCOVA
  if (is.null(options$homogeneityCorrectionBrown)) {
    options$homogeneityCorrectionNone <- TRUE
    options$homogeneityCorrectionBrown <- FALSE
    options$homogeneityCorrectionWelch <- FALSE
  }

So there is no need to use a complexify the QML with a Loader.