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omron-fins: Don't check the Gateway Count byte.

Colin Finck requested to merge ColinFinck/wireshark:fix/omron-gateway-count-is-variable into master

While analyzing the network traffic between an OMRON NS8-TV01B-V2 HMI and an OMRON CJ2M PLC, I discovered that all requests from the HMI have their Gateway Count byte set to 0x07. Responses from the PLC still have a Gateway Count byte set to 0x02. This conflicts with the (20-year-old) protocol documentation by OMRON, but happens nevertheless.

With this check removed, all bytes can be successfully parsed to an OMRON FINS message.

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