Restore the show author functionality to bubble

src/qml/Bubble.qml

@@ -40,6 +40,11 @@ QQC2.Control {
      */
     property var author
 
+    /**
+     * @brief Whether the author should be shown.
+     */
+    required property bool showAuthor
+
     /**
      * @brief The timestamp of the message.
      */
@@ -133,6 +138,7 @@ QQC2.Control {
     contentItem: ColumnLayout {
         RowLayout {
             Layout.maximumWidth: root.maxContentWidth
+            visible: root.showAuthor
             QQC2.Label {
                 Layout.fillWidth: true
                 text: root.author.displayName