RFR: 8214902: Pretty-printing marker annotations add unnecessary parenthesis

[Liam Miller-Cushon]

Hi,

Please consider this small improvement to pretty-printing annotation AST
nodes, which omits the parens for marker annotations (e.g. `@A` vs. `@A()`).

webrev: http://cr.openjdk.java.net/~cushon/8214902/webrev.00/
bug: https://bugs.openjdk.java.net/browse/JDK-8214902
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