Core/Instances: Fix build in older VS versions

Relax const uses in BossBoundaryEntry so the compiler can generate proper
copy assignment operator (error C2582: 'operator =' function is unavailable in 'BossBoundaryEntry')

Also renamed its members to match our coding standards
(public members should be UpperCamelCase)

(cherry picked from commit 954323d9cb13d4ab3d478bcb51eeb157009d8853)

2 files changed, 5 insertions, 4 deletions

diff --git a/src/server/game/Instances/InstanceScript.cpp b/src/server/game/Instances/InstanceScript.cpp
index f9b43293bb9..df0a6a11a1e 100644
--- a/src/server/game/Instances/InstanceScript.cpp
+++ b/src/server/game/Instances/InstanceScript.cpp
@@ -105,8 +105,8 @@ void InstanceScript::SetHeaders(std::string const& dataHeaders)
 void InstanceScript::LoadBossBoundaries(const BossBoundaryData& data)
 {
     for (BossBoundaryEntry const& entry : data)
-        if (entry.bossId < bosses.size())
-            bosses[entry.bossId].boundary.insert(entry.boundary);
+        if (entry.BossId < bosses.size())
+            bosses[entry.bossId].boundary.insert(entry.Boundary);
 }
 
 void InstanceScript::LoadMinionData(const MinionData* data)
diff --git a/src/server/game/Instances/InstanceScript.h b/src/server/game/Instances/InstanceScript.h
index 44bbe91ea36..e2620c85504 100644
--- a/src/server/game/Instances/InstanceScript.h
+++ b/src/server/game/Instances/InstanceScript.h
@@ -79,9 +79,10 @@ struct DoorData
 
 struct BossBoundaryEntry
 {
-    uint32 const bossId;
-    AreaBoundary const* const boundary;
+    uint32 BossId;
+    AreaBoundary const* Boundary;
 };
+
 struct BossBoundaryData
 {
     typedef std::vector<BossBoundaryEntry> StorageType;