QGCPipOverlay.qml: solve bug flightmap not being properly displayed after video disable.

There was a bug when having the video enabled in fullstate while the map was in pip state. If the video was disabled the map was being set to fullstate but not to visible

src/QmlControls/QGCPipOverlay.qml

@@ -70,6 +70,7 @@ Item {
             item1.pipState.state = item1.pipState.fullState
             _fullItem = item1
             _pipOrWindowItem = null
+            item1.visible = true
         }
         _setPipIsExpanded(QGroundControl.loadBoolGlobalSetting(_pipExpandedSettingsKey, true))
     }