Fixed rewriting the logger in logging middleware

[miladz68]

the logger gets rewritten on the middleware which is not correct, it should be copied and modified.

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This change is 

[wojtek-coreum]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @begmaroman, @dzmitryhil, and @ysv)

[ysv]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @begmaroman, @dzmitryhil, and @miladz68)

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http/errors.go line 25 at r1 (raw file):

			err := next(c)
			if err != nil {
				logger := withEchoContext(logger, c)

that is why I always insist on not having name collisions with neither other variables or packages

non-blocking:
but can you please rename the var to smth different ?