fix(utils): use `stringx.strip` to trim string

src/awesomewm.d.tl/utils.tl

@@ -1,3 +1,4 @@
+local stringx = require "pl.stringx"
 local web_sanitize = require "web_sanitize"
 
 local utils = {}
@@ -34,25 +35,8 @@ function utils.map<T, U>(list: { T }, iteratee: function(value: T, position: int
    return mapped
 end
 
--- Extracted from teh Penlight Lua library.
--- Sometime Lua string.gsub can't match unescaped strings.
--- https://stackoverflow.com/a/72666170
-function utils.escape(s: string): string
-   return (s:gsub("[%-%.%+%[%]%(%)%$%^%%%?%*]", "%%%1"))
-end
-
-function utils.replace(s: string, old: string, new: string, n: number): string
-   return (s:gsub(utils.escape(old), new:gsub("%%", "%%%%"), n))
-end
-
-function utils.trim(s: string): string
-   return s:match "^%s*(.-)%s*$"
-end
-
 function utils.sanitize_string(s: string): string
-   return utils.trim(
-      utils.replace(web_sanitize.extract_text(s), "^%s*(.-)%s*$", "%1")
-   )
+   return (stringx.strip(web_sanitize.extract_text(s)))
 end
 
 -- At some point, we should probably write a wrapper to make penlight's function work with pcalls.