chatview: set displayName for files

Change-Id: I7fa866deeb355790ee0dc688a3167728ccc43be9

src/webchathelpers.cpp

@@ -71,6 +71,7 @@ buildInteractionJson(lrc::api::ConversationModel& conversationModel,
             interactionObject.insert("totalSize", QJsonValue(qint64(info.totalSize)));
             interactionObject.insert("progress", QJsonValue(qint64(info.progress)));
         }
+        interactionObject.insert("displayName", QJsonValue(inter.commit["displayName"]));
         break;
     }
     case lrc::api::interaction::Type::INVALID: