Fix missed Context aggregate initialization in Application.cpp

Remove the extra {} that was for the now-deleted Context::coro field
in the RPC::JsonContext construction in Application::startGeometry().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: pratikmankawde

src/xrpld/app/main/Application.cpp

@@ -1425,7 +1425,6 @@ ApplicationImp::setup(boost::program_options::variables_map const& cmdline)
              c,
              Role::ADMIN,
              {},
-             {},
              RPC::apiMaximumSupportedVersion},
             jvCommand};