refactor: remove redundant if statements (#4158)

Remove redundant IF statements

Author: fecqs

lib/Server.js

@@ -1479,10 +1479,6 @@ class Server {
       options.static = [getStaticItem(options.static)];
     } else if (Array.isArray(options.static)) {
       options.static = options.static.map((item) => {
-        if (typeof item === "string") {
-          return getStaticItem(item);
-        }
-
         return getStaticItem(item);
       });
     } else {