use skip_if_not() for improved readibility

Author: cderv

tests/testthat/helpers.R

@@ -1,8 +1,8 @@
 # Use to test quarto availability or version lower than
 skip_if_no_quarto <- function(ver = NULL) {
   skip_if(is.null(quarto_path()), message = "Quarto is not available")
-  skip_if(
-    !quarto_available(min = ver, error = FALSE),
+  skip_if_not(
+    quarto_available(min = ver, error = FALSE),
     message = sprintf(
       "Version of quarto is lower than %s: %s.",
       ver,