Fix some Lua scripts - OnDestroy -> Destroy

Fixes *current instances* of #221

But ideally, there should probably be some kind of instrumentation that
creates warnings about Lua functions that are defined but not used by
anything to prevent issues like this.

Author: Architector4

Data/Browncoats.rte/Devices/Weapons/Heatlance/Heatlance.lua

@@ -126,12 +126,12 @@ function ThreadedUpdate(self)
 	end
 end
 
-function OnDestroy(self)
+function Destroy(self)
 	self.flameSwingLoopSound.Volume = 0;
 	self.plumeLoopSound.Volume = 0;
 end
 
 function OnDetach(self)
 	self.flameSwingLoopSound.Volume = 0;
 	self.plumeLoopSound.Volume = 0;
-end
+end

Data/Browncoats.rte/Scenes/Objects/Breakables/RefineryConsole/RefineryConsole.lua

@@ -6,8 +6,8 @@ function Create(self)
 	self.loopSound:Play(self.Pos);
 end
 
-function OnDestroy(self)
+function Destroy(self)
 
 	self.Activity:SendMessage("RefineryAssault_RefineryConsoleBroken");
 
-end
+end

Data/Browncoats.rte/Scenes/Objects/Breakables/RefineryDrill/RefineryDrill.lua

@@ -33,6 +33,6 @@ function ThreadedUpdate(self)
 	end
 end
 
-function OnDestroy(self)
+function Destroy(self)
 	self.loopSound:Stop(-1);
-end
+end

Data/Browncoats.rte/Scenes/Objects/Breakables/RefineryGenerator/RefineryGenerator.lua

@@ -15,6 +15,6 @@ function ThreadedUpdate(self)
 	end
 end
 
-function OnDestroy(self)
+function Destroy(self)
 	self.Activity:SendMessage("RefineryAssault_RefineryGeneratorBroken");
-end
+end