Correct the priority value for Pushover's Emergency priority. Fixes #160

templates/integrations/add_pushover.html

@@ -61,7 +61,7 @@
 
                 <div class="radio">
                     <label>
-                        <input type="radio" name="po_priority" value="-2">
+                        <input type="radio" name="po_priority" value="2">
                         <span class="text-danger">Emergency Priority.</span>
                         <span class="help">
                         The notification is repeated every