fix: p/onbloc/json/node_test Example test

[jefft0]

Gno now supports Example tests correctly. p/onbloc/json has a test with expected Output but it doesn't run as an Example test. The test name must start with Example and print to stdout. This PR renames TestNode_ExampleMust to Example_TestNode_Must and prints to stdout. Now the Output is checked.

[Gno2D2]

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