Fix WebUI cache behavior for css files

The style.css in public & private folders share the same URI, this
confuses the browser cache, so rename one of them.

src/webui/webui.qrc

@@ -42,7 +42,7 @@
         <file>www/private/transferlist.html</file>
         <file>www/private/upload.html</file>
         <file>www/private/uploadlimit.html</file>
-        <file>www/public/css/style.css</file>
+        <file>www/public/css/login.css</file>
         <file>www/public/login.html</file>
         <file>www/public/scripts/lib/mootools-1.2-core-yc.js</file>
     </qresource>

src/webui/www/public/login.html

@@ -5,7 +5,7 @@
     <meta charset="UTF-8" />
     <title>qBittorrent QBT_TR(Web UI)QBT_TR[CONTEXT=OptionsDialog]</title>
     <link rel="icon" type="image/png" href="images/skin/qbittorrent32.png" />
-    <link rel="stylesheet" type="text/css" href="css/style.css" />
+    <link rel="stylesheet" type="text/css" href="css/login.css" />
     <script src="scripts/lib/mootools-1.2-core-yc.js"></script>
     <script>
         window.onload = function() {