tests: update transaction_tests for new dust threshold

Author: laanwj

src/test/transaction_tests.cpp

@@ -345,7 +345,7 @@ BOOST_AUTO_TEST_CASE(test_IsStandard)
     t.vout[0].nValue = 501; // dust
     BOOST_CHECK(!IsStandardTx(t, reason));
 
-    t.vout[0].nValue = 601; // not dust
+    t.vout[0].nValue = 2730; // not dust
     BOOST_CHECK(IsStandardTx(t, reason));
 
     t.vout[0].scriptPubKey = CScript() << OP_1;