Adding missing qgcView to QGCMapPolygonVisuals instance in SurveyMapVisual.qml

Since disconnectAll will kill this controller before it gets to next
statement

PX4 setup: Put sensors before radio to create the right affordance: We want the user to handle this first

Also made combo box widths larger to accommodate text

Remove showSensorCalibrationOrient

Changed (selected) mission item color to primaryButton instead of buttonHighlight
Adjusted some colors for better contrast
Removed a few JavaScript exceptions caused by the order of object destruction