Fix warning 582 (error prone negation) not applying to subexpressions #94
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This fixes warning 582 not applying properly to subexpressions; the checks were applied to
node[1]rather than directly tonode. Furthermore it also checks forx == not ynow; I've also added some tests for some variants of the error prone negation.See luanti-org/minetest_game#3032 (comment) for the motivation behind this.