Dont bother with new escape code for setting title

Since we are only sending the last command, it cannot have CSI
sequences in it anyway except in extremely contrived situations, so just
strip all ctrl chars out.

shell-integration/bash/kitty.bash

@@ -139,8 +139,7 @@ _ksi_main() {
             last_cmd=$(HISTTIMEFORMAT= builtin history 1)
             last_cmd="${last_cmd#*[[:digit:]]*[[:space:]]}"  # remove leading history number
             last_cmd="${last_cmd#"${last_cmd%%[![:space:]]*}"}"  # remove remaining leading whitespace
-            last_cmd=$(builtin printf "%s" "$last_cmd" | base64)
-            builtin printf "\e]22222;%s\a" "${last_cmd//[[:space:]]}"
+            builtin printf "\e]2;%s\a" "${last_cmd//[[:cntrl:]]}"  # remove any control characters
         }
         _ksi_prompt[ps0_suffix]+='$(_ksi_get_current_command)'
     fi