pak is enabled, but not used during initialization

``` r$> renv::init() - Resolving missing dependencies ... # Downloading packages ------------------------------------------------------- ✔ blob 1.3.0 [50 kB in 0.46s] ✔ mime 0.13 [48 kB in 0.47s] ✔ lifecycle 1.0.5 [133 kB in 0.73s] ... ``` During initialization renv detects missing dependencies from the source code and starts installing (without asking, isn't it a bit too much?), but it's not using pak to do it. If later I explicitly call `renv::install` then `pak` is used as expected. See diagnostics in my previous report https://github.com/rstudio/renv/issues/2280