fix(editview): use `window-close-symbolic` icon for closing editview tabs
fixes
<object class="GtkImage">
<property name="visible">True</property>
<property name="can_focus">False</property>
- <property name="stock">gtk-close</property>
+ <property name="icon_name">window-close-symbolic</property>
</object>
</child>
</object>
