fix(@desktop/chat): Last message in chat is hidden under the chat box

Reduced the gap between list view and ChatBox as per design.
Added logic to scroll to the end of list on the component.onCompleted

fixes #3514

ui/app/AppLayouts/Chat/ChatColumn/ChatMessages.qml

@@ -31,7 +31,6 @@ Item {
     ListView {
         id: chatLogView
         anchors.fill: parent
-        anchors.bottomMargin: Style.current.bigPadding
         spacing: appSettings.useCompactMode ? 0 : 4
         boundsBehavior: Flickable.StopAtBounds
         clip: true
@@ -245,6 +244,8 @@ Item {
         model: messageListDelegate
         section.property: "sectionIdentifier"
         section.criteria: ViewSection.FullString
+
+        Component.onCompleted: scrollToBottom(true)
     }
 
     MessageDialog {