Launcher: hide sidebar tooltips when button updates

Happens with Fly! button when refresh or update occurs.

src/GUI/qml/Sidebar.qml

@@ -72,7 +72,7 @@ Rectangle {
         anchors.bottom: parent.bottom
         anchors.bottomMargin: Style.margin
         enabled: _launcher.canFly
-        disabledText: qsTr("The selected aircraft is not installed")
+        disabledText: qsTr("The selected aircraft is not installed or has updates pending")
         icon: "qrc:///svg/toolbox-fly"
         onClicked: _launcher.fly();
     }

src/GUI/qml/SidebarButton.qml

@@ -18,6 +18,12 @@ Item {
 
     property string disabledText: ""
 
+    onEnabledChanged: {
+        // if we become enabled, ensure we hide the
+        // dsiabled prompt (can happen if hovering over 'fly!')
+        if (enabled) disabledTextBox.hide();
+    }
+
     Rectangle {
         id: baseRect
         anchors.fill: parent