Add hack to fix crash when sending long text reactions

This is some bug in Flow (that is really hard to debug, I can't get it
to exit at all) but we can work around it for a minor visual impact. It
seems to me allow the reaction list to become slightly larger, but
that's about it.

BUG: 504344
FIXED-IN: 25.12.2

src/messagecontent/ReactionComponent.qml

@@ -23,9 +23,7 @@ Flow {
      */
     required property ReactionModel reactionModel
 
-    Layout.fillWidth: true
-    Layout.fillHeight: true
-    Layout.maximumWidth: Message.maxContentWidth
+    // HACK: We do not set Layout properties here, see BUG 504344 for the crash it caused.
 
     spacing: Kirigami.Units.smallSpacing