lg2: minor tweak for readability
lg2: minor tweak for readability

clang-format seems to have damaged the readability of one of the
C++20 Concepts.  Add parens to improve the readability.

Signed-off-by: Patrick Williams <cbb7353e6d953ef360baf960c122346276c6e320@stwcx.xyz>
Change-Id: I0d9e591103bca0ec1d423559fffb4e2a972c3d61

openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging,openbmc/phosphor-logging