fix: fix community image display in the header

ui/app/AppLayouts/Chat/CommunityComponents/CommunityHeaderButton.qml

@@ -21,8 +21,7 @@ Button {
             id: communityImage
             width: 40
             height: 40
-            // TODO get the real image once it's available
-            source: "../../../img/ens-header-dark@2x.png"
+            source: chatsModel.communities.activeCommunity.thumbnailImage
             anchors.verticalCenter: parent.verticalCenter
         }
 
@@ -62,4 +61,4 @@ Button {
             btnBackground.color = Style.current.backgroundHover
         }
     }
-}
+}