Use new extraUnitField

src/FactSystem/FactControls/AltitudeFactTextField.qml

@@ -1,8 +1,10 @@
+import QtQuick                      2.3
 import QGroundControl               1.0
 import QGroundControl.FactSystem    1.0
 
 FactTextField {
-    unitsLabel: fact ? fact.units + _altitudeModeExtraUnits : ""
+    unitsLabel:         fact ? fact.units : ""
+    extraUnitsLabel:    fact ? _altitudeModeExtraUnits : ""
     showUnits:          true
     showHelp:           true
 
@@ -14,7 +16,9 @@ FactTextField {
     readonly property string _altModeAboveTerrainExtraUnits:    qsTr("(Abv Terr)")
     readonly property string _altModeTerrainFrameExtraUnits:    qsTr("(TerrF)")
 
-    property string _altitudeModeExtraUnits: _altModeRelativeExtraUnits
+    property string _altitudeModeExtraUnits: _altModeNoneExtraUnits
+
+    onAltitudeModeChanged: updateAltitudeModeExtraUnits()
 
     function updateAltitudeModeExtraUnits() {
         if (altitudeMode === QGroundControl.AltitudeModeNone) {
@@ -32,6 +36,4 @@ FactTextField {
             _altitudeModeExtraUnits = ""
         }
     }
-
-    onAltitudeModeChanged: updateAltitudeModeExtraUnits()
 }