fix: reset fns when when stopping record (#962)

Co-authored-by: wangfukang <wangfukang@kuaishou.com>

packages/rrweb/src/record/index.ts

@@ -531,6 +531,9 @@ function record<T = eventWithTime>(
     }
     return () => {
       handlers.forEach((h) => h());
+      // reset init fns when stopping record
+      (wrappedEmit as unknown) = undefined;
+      (takeFullSnapshot as unknown) = undefined;
     };
   } catch (error) {
     // TODO: handle internal error