Convert to the proper type

src/webui/www/private/views/preferences.html

@@ -2101,7 +2101,7 @@
             // Share Ratio Limiting
             let max_ratio = -1;
             if ($('max_ratio_checkbox').getProperty('checked')) {
-                max_ratio = $('max_ratio_value').getProperty('value');
+                max_ratio = $('max_ratio_value').getProperty('value').toFloat();
                 if (isNaN(max_ratio) || (max_ratio < 0) || (max_ratio > 9998)) {
                     alert("QBT_TR(Share ratio limit must be between 0 and 9998.)QBT_TR[CONTEXT=HttpServer]");
                     return;