Meta: Tweak shell_include.sh

* `chmod -x` as it's for sourcing, not for executing
* Remove run line, for the same reason
* Rename it from .shell_include.sh to shell_include.sh, since e.g.
  `rg` doesn't search in hidden files by default

No behavior change.

Meta/.shell_include.sh

@@ -1,53 +0,0 @@
-#!/usr/bin/env bash
-# shellcheck disable=SC2034
-# SC2034: "Variable appears unused. Verify it or export it."
-#         Those are intentional here, as the file is meant to be included elsewhere.
-
-# NOTE: If using another privilege escalation binary make sure it is configured or has the appropiate flag
-#       to keep the current environment variables in the launched process (in sudo's case this is achieved
-#       through the -E flag described in sudo(8).
-SUDO="sudo -E"
-
-if [ "$(uname -s)" = "SerenityOS" ]; then
-    SUDO="pls -E"
-fi
-
-die() {
-    echo "die: $*"
-    exit 1
-}
-
-find_executable() {
-  paths=("/usr/sbin" "/sbin")
-
-  if [ "$(uname -s)" = "Darwin" ]; then
-    if [ -n "${HOMEBREW_PREFIX}" ]; then
-      paths+=("${HOMEBREW_PREFIX}/opt/e2fsprogs/bin" "${HOMEBREW_PREFIX}/opt/e2fsprogs/sbin")
-    elif command -v brew > /dev/null 2>&1; then
-      if prefix=$(brew --prefix e2fsprogs 2>/dev/null); then
-        paths+=("${prefix}/bin" "${prefix}/sbin")
-      fi
-    fi
-  fi
-
-  executable="${1}"
-
-  # Prefer tools from PATH over fallback paths
-  if command -v "${executable}"; then
-    return 0
-  fi
-
-  for path in "${paths[@]}"; do
-    if command -v "${path}/${executable}"; then
-      return 0
-    fi
-  done
-
-  # We return the executable's name back to provide meaningful messages on future failure
-  echo "${executable}"
-}
-
-FUSE2FS_PATH="$(find_executable fuse2fs)"
-RESIZE2FS_PATH="$(find_executable resize2fs)"
-E2FSCK_PATH="$(find_executable e2fsck)"
-MKE2FS_PATH="$(find_executable mke2fs)"