chore: disable HTTP for HTTPS only config

[horvathandris]

Currently, for a HTTPS only config like

@EnableWireMock(
  @ConfigureWireMock(port = -1, httpsPort = 0)
)

the WireMockServer's httpDisabled property is not set. This means that the default value (8080) is pulled from new WireMockConfiguration(), instead of no HTTP port.

In this change, I'm simply setting the httpDisabled property according to the config.

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