Update QuicEnableVersion to no longer stack flags

Since cl/254955929, we no longer require the v47 flag to enable v99. This CL reflects this change in QuicEnableVersion.

gfe-relnote: change only impacts test code and quic toy client/server
PiperOrigin-RevId: 255151044
Change-Id: Ic2adfa09310ec605c62d0f3a46a614eee19db990

quic/core/quic_versions.cc

diff --git a/quic/core/quic_versions.cc b/quic/core/quic_versions.cc
index afaae66..0801c02 100644
--- a/quic/core/quic_versions.cc
+++ b/quic/core/quic_versions.cc
@@ -458,10 +458,10 @@
   }
   static_assert(QUIC_ARRAYSIZE(kSupportedTransportVersions) == 6u,
                 "Supported versions out of sync");
-  if (parsed_version.transport_version >= QUIC_VERSION_99) {
+  if (parsed_version.transport_version == QUIC_VERSION_99) {
     SetQuicReloadableFlag(quic_enable_version_99, true);
   }
-  if (parsed_version.transport_version >= QUIC_VERSION_47) {
+  if (parsed_version.transport_version == QUIC_VERSION_47) {
     SetQuicReloadableFlag(quic_enable_version_47, true);
   }
 }