Make sure the navigator disposes after migration

(cherry picked from commit 9bde4b8b33064aa1332bb94866ada07e19d4d0b6)

app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/process/MigrationListScreen.kt

@@ -76,6 +76,10 @@ class MigrationListScreen(private val config: MigrationProcedureConfig) : Screen
                             } + MangaScreen(mangaId)
                             navigator replaceAll newStack.first()
                             navigator.push(newStack.drop(1))
+
+                            // need to set the navigator in a pop state to dispose of everything properly
+                            navigator.push(this@MigrationListScreen)
+                            navigator.pop()
                         } else {
                             navigator.pop()
                         }