Refactoring: fix 'delete' and 'move'-buttons as special elements

assets/layers/last_click/last_click.json

@@ -2,6 +2,12 @@
   "id": "last_click",
   "description": "This layer defines how to render the 'last click'-location. By default, it will show a marker with the possibility to add a new point (if there are some presets) and/or to add a new note (if the 'note' layer attribute is set). If none are possible, this layer won't show up",
   "source": "special",
+  "isShown": {
+    "or": [
+      "has_presets=yes",
+      "has_note_layer=yes"
+    ]
+  },
   "name": null,
   "titleIcons": [],
   "title": {
@@ -153,4 +159,4 @@
       ]
     }
   ]
-}
+}

assets/themes/mapcomplete-changes/mapcomplete-changes.json

@@ -116,7 +116,7 @@
             "mappings": [
               {
                 "if": "theme=advertising",
-                "then": "./assets/themes/advertising/poster_box.svg"
+                "then": "./assets/themes/advertising/icon.svg"
               },
               {
                 "if": "theme=aed",