Revert "Fix ugly font rendering in Windows"

This reverts commit bf31c808.

src/QmlControls/QGCComboBox.qml

@@ -15,7 +15,6 @@ ComboBox {
         textColor: __showHighlight ?
                     control.__qgcPal.buttonHighlightText :
                     control.__qgcPal.buttonText
-        renderType: Text.QtRendering
 
         background: Item {
             implicitWidth: Math.round(TextSingleton.implicitHeight * 4.5)

src/VehicleSetup/FirmwareUpgrade.qml

@@ -376,7 +376,6 @@ QGCView {
             style: TextAreaStyle {
                 textColor:          qgcPal.text
                 backgroundColor:    qgcPal.windowShade
-                renderType:         Text.QtRendering
             }
         }
     } // QGCViewPabel