fix(Core/DB): Fix Malygos not engaging due to IMMUNE_TO_PC spawn flag (#25121)

Co-authored-by: blinkysc <blinkysc@users.noreply.github.com>

data/sql/updates/pending_db_world/rev_1773882866738187733.sql

@@ -0,0 +1,2 @@
+-- Remove incorrect IMMUNE_TO_PC from Malygos spawn flags
+UPDATE `creature` SET `unit_flags` = 0 WHERE `guid` = 132313 AND `id1` = 28859;