Fix wrong status code returning in case of handler with middleware.Timeout throws the panic

[Bl1tz23]

I found out that when the echo.HandlerFunc with middleware.Timeout calls panic, global middleware.Recover() could return a wrong status code to the client, cause inside echoHandlerFuncWrapper.ServeHTTP method the originalWriter wasn't restored if handler throws the panic.
This pull request must fix this issue.

[codecov]

Codecov Report

Merging #1864 (48fa624) into master (6430665) will increase coverage by 0.61%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## master #1864 +/- ## ========================================== + Coverage 89.57% 90.19% +0.61%  ========================================== Files 31 31 Lines 2735 2765 +30 ========================================== + Hits 2450 2494 +44  + Misses 184 173 -11  + Partials 101 98 -3 

Impacted Files	Coverage Δ
middleware/timeout.go	100.00% <100.00%> (ø)
middleware/jwt.go	79.80% <0.00%> (+1.91%)	⬆️
middleware/static.go	70.00% <0.00%> (+2.83%)	⬆️
middleware/key_auth.go	96.55% <0.00%> (+29.88%)	⬆️

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