Undo the ansi_collapse() fix

Will have a different workaround.

R/glue.R

@@ -130,15 +130,8 @@ collapse_head_notrim <- function(x, trunc, sep, sep2, last, ellipsis) {
 
   lnx <- length(x)
 
-  if (lnx == 1L)
-    return(x)
-  if (lnx == 2L) {
-    # Handle the case where last is changed and sep2 is not
-    if (sep2 == " and " & last != ", and ")
-      return(paste0(x, collapse = last))
-    else
-      return(paste0(x, collapse = sep2))
-  }
+  if (lnx == 1L) return(x)
+  if (lnx == 2L) return(paste0(x, collapse = sep2))
   if (lnx <= trunc) {
     # no truncation
     return(paste0(