Move macro call

During development of the v28 support we re-ordered some macro calls,
so as not to hold up an external contributor with triviality I acked
and merged as it was.

Put the macro calls in the same order so that when one diffs
`v27_api.rs` and `v28_api.rs` there are no false positives in the
diff.

Internal change only.

Author: tcharding

integration_test/tests/v28_api.rs

@@ -8,10 +8,10 @@ use integration_test::*;
 mod blockchain {
     use super::*;
 
-    impl_test_v17__getblockchaininfo!();
     impl_test_v17__getbestblockhash!();
     impl_test_v17__getblock_verbosity_0!();
     impl_test_v17__getblock_verbosity_1!();
+    impl_test_v17__getblockchaininfo!();
 }
 
 // == Control ==