MessageBar: show less is only visible when the context menu is open

Changed the property of ToolTipMoreButton on the messageBar to ensure that the show less
text display properly only when the context menu is open and not while holding click.

Gitlab: #1904
Change-Id: I4f74802d42e58c38abb3b64dc4277f5c1b79a5f6

src/app/mainview/components/MessageFormatBar.qml

@@ -496,9 +496,10 @@ Rectangle {
                     parent: showMoreButton
                     visible: showMoreButton.hovered && (text.length > 0)
                     delay: Qt.styleHints.mousePressAndHoldInterval
-                    text: showMoreButton.down ? JamiStrings.showLess : JamiStrings.showMore
+                    text: showMoreButton.popup.visible ? JamiStrings.showLess : JamiStrings.showMore
                 }
 
+
                 indicator: ResponsiveImage {
 
                     width: 20