SETTINGS_HEADER_TABLE_SIZE is not honoured

[khteh]

ALB explicitly sets SETTINGS_HEADER_TABLE_SIZE to 0 which indicates the backend target application to not use dynamic indexes, but for some reason the library does not respect the setting, and backend target application is responding to ALB with the dynamic index's (value more than 61). Any attempt of an backend target application server to use indexes from the dynamic range is a bug in the server. The library sent invalid http2 table index: 67