Fix cancel button click listener.

Author: Onuray Sahin

vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginActivity.kt

@@ -88,7 +88,7 @@ class QrCodeLoginActivity : SimpleFragmentActivity() {
     }
 
     private fun handleNavigateToStatusScreen() {
-        addFragmentToBackstack(
+        addFragment(
                 views.container,
                 QrCodeLoginStatusFragment::class.java,
                 tag = FRAGMENT_QR_CODE_STATUS_TAG

vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginShowQrCodeFragment.kt

@@ -44,7 +44,7 @@ class QrCodeLoginShowQrCodeFragment : VectorBaseFragment<FragmentQrCodeLoginShow
 
     private fun initCancelButton() {
         views.qrCodeLoginShowQrCodeCancelButton.debouncedClicks {
-            parentFragmentManager.popBackStack()
+            activity?.onBackPressed()
         }
     }
 

vector/src/main/java/im/vector/app/features/login/qr/QrCodeLoginStatusFragment.kt

@@ -46,7 +46,7 @@ class QrCodeLoginStatusFragment : VectorBaseFragment<FragmentQrCodeLoginStatusBi
 
     private fun initCancelButton() {
         views.qrCodeLoginStatusCancelButton.debouncedClicks {
-            parentFragmentManager.popBackStack()
+            activity?.onBackPressed()
         }
     }