Fix small color bug

There was a small bug color in Dark theme.

p/themes/Dark/freshrss.css

@@ -506,10 +506,10 @@
 			font-style: italic;
 		}
 	.pagination:first-child .item {
-		border-bottom: 1px solid #aaa;
+		border-bottom: 1px solid #2f2f2f;
 	}
 	.pagination:last-child .item {
-		border-top: 1px solid #aaa;
+		border-top: 1px solid #2f2f2f;
 	}
 
 #nav_entries {