core: Workaround invalid html on AlarmTool_viewAlarmList

When listboxs has an editable field, but the field is non editable, it
produces a markup like:
  <a href="link to the line"><EditableField/></a>
This is fine for most fields, but some editable fields are rendered as
an <input> even if they are not editable - this is the case for
CheckBoxField.
To prevent rendering <a><input></a> which is not valid HTML, configure
the enabled field as non-editable on alarm list view, with this change
listbox treats the field as an editable field and just render the field
as <EditableField/> without the <a>.
To keep the same visual appearance of having a disabled checkbox field,
make this field disabled with extra.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/AlarmTool_viewAlarmList/listbox_enabled.xml

@@ -137,7 +137,7 @@
                 </item>
                 <item>
                     <key> <string>editable</string> </key>
-                    <value> <int>0</int> </value>
+                    <value> <int>1</int> </value>
                 </item>
                 <item>
                     <key> <string>enabled</string> </key>
@@ -149,7 +149,7 @@
                 </item>
                 <item>
                     <key> <string>extra</string> </key>
-                    <value> <string></string> </value>
+                    <value> <string>disabled</string> </value>
                 </item>
                 <item>
                     <key> <string>hidden</string> </key>