add href="#" on nature theme button

lib/views/admin/customize.html

@@ -65,7 +65,7 @@
                 data-theme="{{ webpack_asset('style-theme-default-dark').css }}">
               {% include 'widget/theme-colorbox.html' %}
             </a>
-            <a id="theme-option-nature"
+            <a id="theme-option-nature" href="#"
                 class="nature {% if 'nature' === settingForm['customize:theme'] %}active{% endif %}"
                 onclick="selectTheme('nature')"
                 data-theme="{{ webpack_asset('style-theme-nature').css }}">