Use DelegateTypeRole searchmodel

Change EventTypeRole to DelegateTypeRole to match updated message event model.

src/models/searchmodel.cpp

@@ -135,7 +135,7 @@ int SearchModel::rowCount(const QModelIndex &parent) const
 QHash<int, QByteArray> SearchModel::roleNames() const
 {
     return {
-        {EventTypeRole, "eventType"},
+        {DelegateTypeRole, "delegateType"},
         {DisplayRole, "display"},
         {AuthorRole, "author"},
         {ShowSectionRole, "showSection"},

src/models/searchmodel.h

@@ -55,7 +55,7 @@ public:
      */
     enum Roles {
         DisplayRole = Qt::DisplayRole, /**< The message string. */
-        EventTypeRole, /**< The type of the event. */
+        DelegateTypeRole, /**< The type of the event. */
         ShowAuthorRole, /**< Whether the author should be shown (always true). */
         AuthorRole, /**< The author of the event. */
         ShowSectionRole, /**< Whether the section header should be shown. */