FlyViewMap.qml: connect roilocationitem to vehicle roiCoordChanged:

Instead of setting manually the roilocationitem coordinate in
flyviewmap.qml, we rely instead on the new signal from vehicle.
This way, changes in roi in other parts of the app than map clicks,
like gimbal controls point home, will make the roi indicator appear

src/FlightDisplay/FlyViewMap.qml

@@ -495,6 +495,13 @@ FlightMap {
         anchorPoint.x:  sourceItem.anchorPointX
         anchorPoint.y:  sourceItem.anchorPointY
 
+        Connections {
+            target: _activeVehicle
+            onRoiCoordChanged: {
+                roiLocationItem.show(centerCoord)
+            }
+        }
+
         MouseArea {
             anchors.fill: parent
             onClicked: {
@@ -638,7 +645,6 @@ FlightMap {
                     if (popup.opened) {
                         popup.close()
                     }
-                    roiLocationItem.show(mapClickCoord)
                     globals.guidedControllerFlyView.executeAction(globals.guidedControllerFlyView.actionROI, mapClickCoord, 0, false)
                 }
             }