Fix that you can only cancel in WizardDialog

CURA-6483

resources/qml/Cura.qml

@@ -795,7 +795,6 @@ UM.MainWindow
         title: catalog.i18nc("@title:window", "Add Printer")
         model: CuraApplication.getAddPrinterPagesModel()
         progressBarVisible: false
-        hasCancelButton: true
     }
 
     Cura.WizardDialog
@@ -804,7 +803,6 @@ UM.MainWindow
         title: catalog.i18nc("@title:window", "What's New")
         model: CuraApplication.getWhatsNewPagesModel()
         progressBarVisible: false
-        hasCancelButton: false
     }
 
     Connections

resources/qml/WelcomePages/AddNetworkOrLocalPrinterContent.qml

@@ -104,6 +104,20 @@ Item
         }
     }
 
+    // This "Back" button only shows in the "Add Machine" dialog, which has "back_button_text" set to "Cancel"
+    Cura.SecondaryButton
+    {
+        id: backButton
+        anchors.left: parent.left
+        anchors.bottom: parent.bottom
+        visible: base.currentItem.previous_page_button_text
+        text: base.currentItem.previous_page_button_text
+        onClicked:
+        {
+            base.endWizard()
+        }
+    }
+
     Cura.PrimaryButton
     {
         id: nextButton

resources/qml/WelcomePages/WizardDialog.qml

@@ -31,7 +31,6 @@ Window
 
     property var model: null  // Needs to be set by whoever is using this dialog.
     property alias progressBarVisible: wizardPanel.progressBarVisible
-    property alias hasCancelButton: cancelButton.visible
 
     onVisibilityChanged:
     {
@@ -54,20 +53,4 @@ Window
         target: model
         onAllFinished: dialog.hide()
     }
-
-    Cura.SecondaryButton
-    {
-        id: cancelButton
-
-        text: catalog.i18nc("@button", "Cancel")
-
-        visible: false
-
-        anchors.left: parent.left
-        anchors.bottom: parent.bottom
-        anchors.margins: UM.Theme.getSize("default_margin").width
-
-        enabled: true
-        onClicked: dialog.visible = false
-    }
 }