Fix case sensitivity in collision position field

Author: subhadee-ali

PWGCF/TwoParticleCorrelations/Tasks/lambdaSpinPolarization.cxx

@@ -156,7 +156,7 @@ DECLARE_SOA_COLUMN(CollisionIndex, collisionIndex, int);
 DECLARE_SOA_TABLE(LambdaMixEventCollisions, "AOD", "LAMBDAMIXCOLS", o2::soa::Index<>,
                   lambdamixeventcollision::CollisionIndex,
                   lambdacollision::Cent,
-                  aod::Collision::PosZ);
+                  aod::collision::PosZ);
 
 using LambdaMixEventCollision = LambdaMixEventCollisions::iterator;