Fix handling payload timer after payload got consumed

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 90.91%. Comparing base (3b49828) to head (af723f2).

Files	Patch %	Lines
ntex/src/http/h1/dispatcher.rs	88.88%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #366 +/- ## ======================================= Coverage 90.90% 90.91% ======================================= Files 198 198 Lines 31872 31876 +4 ======================================= + Hits 28974 28980 +6 + Misses 2898 2896 -2 ```

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