Update t.test test expectations for new error in R >= 4.4

[slager]

In R version >= 4.4, an error is now thrown if the paired argument is used in a call to the t.test.formula method. The error happens if the paired argument is used at all, i.e. it doesn't matter if it's TRUE or FALSE.

See here:

The formula methods for t.test() and wilcox.test() now catch when paired is passed, addressing PR#14359; use Pair(x1, x2) ~ 1 for a paired test.

Several such calls took place in setting up the testthat expectations for VISCfunctions, which were leading to failed unit tests on R 4.4.1, and I believe I've fixed those here.

[slager]

Merged changes in develop from #91 into this PR branch, and now all the CI checks are passing.

[mayerbry]

thanks for updating this. I did a little extra investigation and it doesn't seem possible to produce the error through specification of two_samp_cont_test itself, which is a good thing