constructor patterns should not require parentheses

[coord-e]

the syntax for constructor patterns is not (c p1 p2 ... pn) but c p1 p2 ... pn in current Egison

[coord-e]

then we must handle ! as an atom pattern（https://github.com/egison/egison/blob/master/hs-src/Language/Egison/ParserNonS.hs#L692）