Link to maintenance view rather than edit

Because:
- The intention of the link is to show the full details of a maintenance
  task, not to edit it.
- The user might not even have access to edit a task, but can still
  have access to view its details.

Fixes #2255

python/nav/web/templates/ipdevinfo/frag-ipdevinfo.html

@@ -329,7 +329,7 @@
                   <ul class="normalize-font-size">
                     {% for task in current_maintenance_tasks %}
                       <li>
-                        <a href="{% url 'maintenance-edit' task.id %}">
+                        <a href="{% url 'maintenance-view' task.id %}">
                           {{ task.description }}
 
                         </a>
@@ -368,7 +368,7 @@
                   <ul class="normalize-font-size">
                     {% for task in future_maintenance_tasks %}
                       <li>
-                        <a href="{% url 'maintenance-edit' task.id %}">
+                        <a href="{% url 'maintenance-view' task.id %}">
                           {{ task.description }}
                         </a>
                         <div>