chore(Onboarding): continue the flow only after a successful unblock

- in other words, stop if we want some other flow instead, e.g. the
factory reset

ui/app/AppLayouts/Onboarding2/OnboardingFlow.qml

@@ -360,7 +360,9 @@ SQUtils.QObject {
         }
         onKeycardFactoryResetRequested: root.keycardFactoryResetRequested()
 
-        onFinished: {
+        onFinished: (success) => {
+            if (!success)
+               return
             if (root.loginScreen) {
                 root.loginRequested(root.loginScreen.selectedProfileKeyId,
                                     Onboarding.LoginMethod.Keycard, { pin })

ui/app/AppLayouts/Onboarding2/UnblockWithPukFlow.qml

@@ -23,7 +23,7 @@ SQUtils.QObject {
     signal keycardPinCreated(string pin)
     signal reloadKeycardRequested
     signal keycardFactoryResetRequested
-    signal finished
+    signal finished(bool success)
 
     function init() {
         root.stackView.push(d.initialComponent())
@@ -47,7 +47,7 @@ SQUtils.QObject {
 
         function finishWithFactoryReset() {
             root.keycardFactoryResetRequested()
-            root.finished()
+            root.finished(false)
         }
     }
 
@@ -101,7 +101,7 @@ SQUtils.QObject {
                 StatusButton {
                     anchors.horizontalCenter: parent.horizontalCenter
                     text: qsTr("Continue")
-                    onClicked: root.finished()
+                    onClicked: root.finished(true)
                 }
             ]
         }