remove unnecessary #endif in Sponsor.h and sponsor.h

include/xrpl/protocol/Sponsor.h

@@ -15,5 +15,3 @@ addSerializeSponsorData(Serializer& msg, AccountID const& sponsorID, std::uint32
 }
 
 }  // namespace xrpl
-
-#endif

src/test/jtx/sponsor.h

@@ -89,5 +89,3 @@ ledgerEntry(jtx::Env& env, jtx::Account const& sponsor, jtx::Account const& spon
 }  // namespace jtx
 }  // namespace test
 }  // namespace xrpl
-
-#endif