Update shebangs in installed shellscripts to meet rpmlint and match provided paths at [pkgs.org](https://fedora.pkgs.org/41/fedora-x86_64/elvish-0.21.0-4.fc41.x86_64.rpm.html)

src/shell-integration/bash/bash-preexec.sh

@@ -1,3 +1,4 @@
+#!/usr/bin/bash
 # bash-preexec.sh -- Bash support for ZSH-like 'preexec' and 'precmd' functions.
 # https://github.com/rcaloras/bash-preexec
 #

src/shell-integration/bash/ghostty.bash

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/bash
 #
 # This is originally based on the recommended bash integration from
 # the semantic prompts proposal as well as some logic from Kitty's

src/shell-integration/elvish/lib/ghostty-integration.elv

@@ -1,3 +1,4 @@
+#!/usr/bin/elvish
 {
   fn restore-xdg-dirs {
     use str

src/shell-integration/zsh/ghostty-integration

@@ -1,4 +1,4 @@
-#!/usr/bin/env zsh
+#!/usr/bin/zsh
 #
 # Based on (started as) a copy of Kitty's zsh integration. Kitty is
 # distributed under GPLv3, so this file is also distributed under GPLv3.