Remove verbose = 0 in flash calls in vignettes

[pcarbo]

In the vignettes, I think it is helpful to first illustrate flash with the verbose output. To hide the output in the rendered HTML, you can use the results = "hide" chunk option (see here).

[willwerscheid]

In the first flash call the output is included. I could use results = "hide" for subsequent calls but that would require moving the commands that I do want output for (e.g., c(const_elbo = fit_default$elbo, bycol_elbo = fit_var_bycol$elbo)) and I'm not sure I agree that suppressing output via R Markdown is better than showing the user how to suppress it.

[pcarbo]

Okay.