Revert "Use extruderList rather than deprecated extruders property"

This reverts commit 458acb356f11f50c3327b5af0be8531fb761548f.
The change was wrong. The code refers to PrinterOutputModel.extruders which is not deprecated, not to GlobalStack.extruders (which is deprecated).

Fixes #8204.

resources/qml/PrintMonitor.qml

@@ -77,7 +77,7 @@ Item
                 Repeater
                 {
                     id: extrudersRepeater
-                    model: activePrinter != null ? activePrinter.extruderList : null
+                    model: activePrinter != null ? activePrinter.extruders : null
 
                     ExtruderBox
                     {