Fix parsing NOT sequence in tsquery

Teodor Sigaev <teodor@sigaev.ru>

Commit: 00f304ce2dd86f4b76606225b41e0854a3362628
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2016-07-15T17:01:41Z
Releases: 9.6.0
Fix parsing NOT sequence in tsquery

Digging around bug #14245 I found that commit
6734a1cacd44f5b731933cbc93182b135b167d0c missed that NOT operation is
right associative in opposite to all other. This miss is resposible for
tsquery parser fail on sequence of NOT operations

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