lib/utilities: use $XDG_CACHE_HOME properly

We should fall back to the default location, not use an entirely different one.

lib/utilities.bash

@@ -127,7 +127,7 @@ function _bash-it-component-help() {
 function _bash-it-component-cache-file() {
 	local _component_to_cache _file_path _result="${2:-${FUNCNAME[0]//-/_}}"
 	_bash-it-component-pluralize "${1?${FUNCNAME[0]}: component name required}" _component_to_cache
-	_file_path="${XDG_CACHE_HOME:-${BASH_IT?}/tmp/cache}${XDG_CACHE_HOME:+/bash_it}/${_component_to_cache?}"
+	_file_path="${XDG_CACHE_HOME:-${HOME?}/.cache}/bash/${_component_to_cache?}"
 	[[ -f "${_file_path}" ]] || mkdir -p "${_file_path%/*}"
 	printf -v "${_result?}" '%s' "${_file_path}"
 }
@@ -213,7 +213,7 @@ function _bash-it-component-item-is-enabled() {
 		component_type="${1}" item_name="${2}"
 	fi
 
-	for each_file in "${BASH_IT}/enabled"/*"${BASH_IT_LOAD_PRIORITY_SEPARATOR?}${item_name}.${component_type}"*."bash" \
+	for each_file in "${BASH_IT?}/enabled"/*"${BASH_IT_LOAD_PRIORITY_SEPARATOR?}${item_name}.${component_type}"*."bash" \
 		"${BASH_IT}/${component_type}"*/"enabled/${item_name}.${component_type}"*."bash" \
 		"${BASH_IT}/${component_type}"*/"enabled"/*"${BASH_IT_LOAD_PRIORITY_SEPARATOR?}${item_name}.${component_type}"*."bash"; do
 		[[ -f "${each_file}" ]] && return