scripted-diff: Replace UINT256_ONE() with uint256::ONE

-BEGIN VERIFY SCRIPT-
sed -i '/inline.* UINT256_ONE() {/,+1d' src/uint256.h
sed -i 's/UINT256_ONE()/uint256::ONE/' $(git grep -l UINT256_ONE)
-END VERIFY SCRIPT-

src/script/interpreter.cpp

@@ -1375,7 +1375,7 @@ uint256 SignatureHash(const CScript& scriptCode, const T& txTo, unsigned int nIn
     if ((nHashType & 0x1f) == SIGHASH_SINGLE) {
         if (nIn >= txTo.vout.size()) {
             //  nOut out of range
-            return UINT256_ONE();
+            return uint256::ONE;
         }
     }