Small ui tweaks

Some things looked wrong in Outdoor mode and there
were some misalignments between labels and inputs

src/FlightMap/Widgets/PhotoVideoControl.qml

@@ -25,7 +25,7 @@ import QGroundControl.FactControls      1.0
 
 Rectangle {
     height:     mainLayout.height + (_margins * 2)
-    color:      "#80000000"
+    color:      Qt.rgba(qgcPal.window.r, qgcPal.window.g, qgcPal.window.b, 0.5)
     radius:     _margins
     visible:    (_mavlinkCamera || _videoStreamAvailable || _simpleCameraAvailable) && multiVehiclePanelSelector.showSingleVehiclePanel
 

src/QmlControls/QGCComboBox.qml

@@ -27,6 +27,7 @@ T.ComboBox {
                              contentItem.implicitWidth + leftPadding + rightPadding + padding)
     implicitHeight: Math.max(background ? background.implicitHeight : 0,
                              Math.max(contentItem.implicitHeight, indicator ? indicator.implicitHeight : 0) + topPadding + bottomPadding)
+    baselineOffset: contentItem.y + text.baselineOffset
     leftPadding:    padding + (!control.mirrored || !indicator || !indicator.visible ? 0 : indicator.width + spacing)
     rightPadding:   padding + (control.mirrored || !indicator || !indicator.visible ? 0 : indicator.width)
 

src/ui/preferences/MavlinkSettings.qml

@@ -624,8 +624,8 @@ Rectangle {
                             text:               QGroundControl.mavlinkLogManager.feedback
                             enabled:            !_disableDataPersistence
                             style: TextAreaStyle {
-                                textColor:          qgcPal.windowShade
-                                backgroundColor:    qgcPal.text
+                                textColor:          qgcPal.textFieldText
+                                backgroundColor:    qgcPal.textField
                             }
                         }
                     }