Revert "Get _ksi_debug_print working again"

This reverts commit ff63e58f95833e10146568df914438ff4d4f8e12.

shell-integration/zsh/kitty-integration

@@ -32,13 +32,10 @@ builtin emulate -L zsh -o no_warn_create_global
 # 2: none of the above.
 builtin typeset -gi _ksi_state
 
-# Asks kitty to print $@ to its STDOUT. This is for debugging.
+# Asks kitty to print $@ to its stdout. This is for debugging.
 _ksi_debug_print() {
-    builtin local data saved
-    saved="$IFS"
-    IFS=" "
-    data=$(command base64 <<< "$*") 
-    IFS="$saved"
+    builtin local data
+    data=$(command base64 <<<"${(j: :}@}") || builtin return
     builtin printf '\eP@kitty-print|%s\e\\' "${data//$'\n'}"
 }