Made it so parentbreakwound gets set to the same as breakwound, if not specifically defined

This matches what's described in the changelog and it was an oversight that it wasn't happening

Author: garethyr

Entities/Attachable.cpp

@@ -118,6 +118,7 @@ namespace RTE {
 			reader >> m_JointOffset;
 		} else if (propName == "BreakWound") {
 			m_BreakWound = dynamic_cast<const AEmitter *>(g_PresetMan.GetEntityPreset(reader));
+			if (!m_ParentBreakWound) { m_ParentBreakWound = m_BreakWound; }
 		} else if (propName == "ParentBreakWound") {
 			m_ParentBreakWound = dynamic_cast<const AEmitter *>(g_PresetMan.GetEntityPreset(reader));
 		} else if (propName == "InheritsHFlipped") {