add a color to the admin panel's stats for better dark mode visibility

customize.dist/src/less2/include/sidebar-layout.less

@@ -73,6 +73,9 @@
 
             // Following rules are only in settings
             .cp-sidebarlayout-element {
+                pre {
+                    color: @cryptpad_text_col; // XXX
+                }
                 label:not(.noTitle), .label {
                     display: block;
                     font-weight: bold;