bch: revert config_pool donation gate to bare >=36 (bucket-3, mirror BTC)

The get_donation_script version gate was deliberately left bare in #160
as bucket-3 pre-V36 transition compat (per-coin, temporary, dropped after
the crossing-soak) and to mirror BTC 1:1 (BTC did not route its donation
gate through core::version_gate either). Routing it through the SSOT in
268eeec silently diverged BCH from BTC; revert. Whether the donation
predicate should standardize cross-coin is a [decision-needed] for the
operator/integrator, not a unilateral BCH change. node.hpp SSOT
delegation (genuine #160 miss) is retained.

Author: frstrtr

src/impl/bch/config_pool.hpp

@@ -6,7 +6,6 @@
 #include <btclibs/util/strencodings.h>
 #include <btclibs/crypto/sha256.h>
 #include <core/uint256.hpp>
-#include <core/version_gate.hpp>   // SSOT: core::version_gate::is_v36_active
 
 #include <array>
 #include <cstdint>
@@ -154,7 +153,7 @@ class PoolConfig : protected core::Fileconfig
     // use the combined P2SH 1-of-2 multisig script. Same shape as BTC/LTC.
     static std::vector<unsigned char> get_donation_script(int64_t share_version)
     {
-        if (core::version_gate::is_v36_active(share_version))
+        if (share_version >= 36)
             return {COMBINED_DONATION_SCRIPT.begin(), COMBINED_DONATION_SCRIPT.end()};
         return {DONATION_SCRIPT.begin(), DONATION_SCRIPT.end()};
     }