Improve detection of completion for Link new device flow

The SDK emits a Done progress once complete, but our listener might have been deallocated before receiving the done.

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkDesktopHandler.kt

@@ -54,6 +54,8 @@ class RustLinkDesktopHandler(
                     }
                 }
             )
+            // We emit Done in case the progress listener was deallocated before scan() sent the Done
+            _linkDesktopStep.emit(LinkDesktopStep.Done)
         } catch (e: QrCodeDecodeException) {
             Timber.tag(tag.value).w(e, "Invalid QR code scanned")
             _linkDesktopStep.emit(

libraries/matrix/impl/src/main/kotlin/io/element/android/libraries/matrix/impl/linknewdevice/RustLinkMobileHandler.kt

@@ -49,6 +49,8 @@ class RustLinkMobileHandler(
                     }
                 }
             )
+            // We emit Done in case the progress listener was deallocated before generate() sent the Done
+            _linkMobileStep.emit(LinkMobileStep.Done)
         } catch (e: HumanQrGrantLoginException) {
             Timber.tag(tag.value).w(e, "Error during QR login grant")
             _linkMobileStep.emit(LinkMobileStep.Error(e.map()))