fix: use MaxBodySize value inside Modsecurity struct

[acouvreur]

The MaxBodySize wasnt forwarded to the Modsecurity struct which uses its own MaxBodySize.

Something is still weird, its how the test was working,

[acouvreur]

Oh its because in the tests, we initialize the Modsecurity struct

traefik-modsecurity-plugin/modsecurity_test.go

Lines 127 to 133 in bf893e0

	middleware := &Modsecurity{
	next: httpServiceHandler,
	modSecurityUrl: modsecurityMockServer.URL,
	maxBodySize: 1024,
	name: "modsecurity-middleware",
	logger: log.New(io.Discard, "", log.LstdFlags),
	}

[github-actions]

🎉 This PR is included in version 1.2.1 🎉

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