Better fix for kitten not being in PATH

Add it to PATH just as we add the kitty dir to PATH. Ensures the correct
kitten is in PATH, corresponding to the correct kitty.

shell-integration/bash/kitty.bash

@@ -209,9 +209,7 @@ _ksi_main() {
         _ksi_prompt[ps0]+="\[\e]133;C\a\]"
     fi
 
-    [[ -z "${KITTY_KITTEN_EXE}" ]] && KITTY_KITTEN_EXE="kitten"
-    alias edit-in-kitty="${KITTY_KITTEN_EXE} edit-in-kitty"
-    builtin unset KITTY_KITTEN_EXE
+    alias edit-in-kitty="kitten edit-in-kitty"
 
     if [[ "${_ksi_prompt[complete]}" == "y" ]]; then
         _ksi_completions() {