Unnecessary parentheses from `:(-x*y)`

[korsbo]

-x does not need parentheses in this case.

[gustaphe]

I just today noticed a similar issue:

julia> latexify(:( 1 < 2))
L"$\left( 1  < 2 \right)$"

It's the same for all the comparisons (==, <=, !=...), but not for assignment (=).