docs: point loader path at the renamed project folder

The project directory no longer carries the name it had when the loader was
written. A @require that does not resolve makes Tampermonkey skip the script
silently, which is indistinguishable from it never having been installed —
so a stale path here costs a debugging session before anyone suspects the
path. The README carried the same path in its setup instructions, and its
title still described a collection of scripts rather than the single one
that remains.

dev/rin-mobile.dev.user.js

@@ -4,7 +4,7 @@
 // @description  Dev-Loader: laedt rin-mobile.user.js live von der Platte
 // @version      2.1
 // @match        *://cs.rin.ru/forum/*
-// @require      file:///C:/Projekte/ios_safari_userscripts/rin-mobile.user.js
+// @require      file:///C:/Projekte/rin-mobile-userscript/rin-mobile.user.js
 // @run-at       document-start
 // @grant        none
 // ==/UserScript==