fi-0084: Default members disallowed on method payload structs {:#fi-0084}

Warning: Default members are no longer allowed on any new FIDL struct layouts.

Structs used as method paylods may not specify default members:

{% include “docs/reference/fidl/language/error-catalog/label/_bad.md” %}

{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/bad/fi-0084.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}

Remove the default members from the relevant struct declaration:

{% include “docs/reference/fidl/language/error-catalog/label/_good.md” %}

{% includecode gerrit_repo="fuchsia/fuchsia" gerrit_path="tools/fidl/fidlc/tests/fidl/good/fi-0084.test.fidl" exclude_regexp="\/\/ (Copyright 20|Use of|found in).*" %}

Note: Default struct members have been removed by RFC-0160: Remove support for FIDL struct defaults, and are currently deprecated, with no new uses cases being supported. See fi-0050 for more information.