euscanwww: Favourite/Unfavourite template code refactored

* Now is more DRY, the JS code and the HTML code are in one place
* It works even without JS

Signed-off-by: volpino <fox91@anche.no>

euscanwww/htdocs/js/favourite.js

@@ -0,0 +1,23 @@
+$(document).ready(function() {
+  $(".favourite-form").submit(function(e) {
+    e.preventDefault();
+    e.stopPropagation();
+
+    $.post($(this).attr("action"), {packages: window.packages}, function() {
+      $(".unfavourite-button").removeClass("hide");
+      $(".favourite-button").addClass("hide");
+    });
+    return false;
+  });
+
+  $(".unfavourite-form").submit(function(e) {
+    e.preventDefault();
+    e.stopPropagation();
+
+    $.post($(this).attr("action"), {packages: window.packages}, function() {
+      $(".favourite-button").removeClass("hide");
+      $(".unfavourite-button").addClass("hide");
+    });
+    return false;
+  });
+});