Fix bug which mutates user expressions in constraint macro #3883
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Closes #3882
This is a temporary fix. A longer-term approach is to return the
is_mutable::Bool
value from MutableArithemtics:https://github.com/jump-dev/MutableArithmetics.jl/blob/d47000d5e02100458aff33670684a95f105ec40a/src/rewrite.jl#L341
which would let JuMP decide whether it needed to call
copy_if_mutable
.