refactor(DefaultHeader): Dashboard router link

Author: xidedix

src/containers/DefaultLayout/DefaultHeader.js

@@ -30,7 +30,7 @@ class DefaultHeader extends Component {
 
         <Nav className="d-md-down-none" navbar>
           <NavItem className="px-3">
-            <NavLink href="/">Dashboard</NavLink>
+            <Link to="/" className="nav-link" >Dashboard</Link>
           </NavItem>
           <NavItem className="px-3">
             <Link to="/users">Users</Link>