fix: wrap conf macro argument in parentheses in pairHistManager

Author: IgorPtak

PWGCF/Femto/Core/pairHistManager.h

@@ -385,9 +385,9 @@ constexpr std::array<histmanager::HistInfo<PairHist>, kPairHistogramLast>
     {kTrueMinvVsMinv, {(conf).massInv, (conf).massInv}},           \
     {kTrueMultVsMult, {(conf).multiplicity, (conf).multiplicity}}, \
     {kTrueCentVsCent, {(conf).centrality, (conf).centrality}},     \
-    {kTrueQoutVsQout, {conf.qout, conf.qout}},                     \
-    {kTrueQsideVsQside, {conf.qside, conf.qside}},                 \
-    {kTrueQlongVsQlong, {conf.qlong, conf.qlong}},
+    {kTrueQoutVsQout, {(conf).qout, (conf).qout}},                 \
+    {kTrueQsideVsQside, {(conf).qside, (conf).qside}},             \
+    {kTrueQlongVsQlong, {(conf).qlong, (conf).qlong}},
 
 // pure mc-truth pair (no reco counterpart) — reuses the same analysis binning,
 // since there is no separate "true" axis (conf)iguration: the truth value IS the