add missing unicode include to query.c
add missing unicode include to query.c

it causes problems with building tree-sitter with cgo
tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter,tree-sitter/tree-sitter