fix swap of eastl::list<unique_ptr[]>

...or any other type that has deleted dtor.
```
const this_type temp(*this); // << This would attept to call copy ctor of unique_ptr<> which is explicitly deleted
*this = x;
x     = temp;
```

include/EASTL/list.h

@@ -1575,8 +1575,8 @@ namespace eastl
 			DoSwap(x);
 		else // else swap the contents.
 		{
-			const this_type temp(*this); // Can't call eastl::swap because that would
-			*this = x;                   // itself call this member swap function.
+			this_type temp(*this); // Can't call eastl::swap because that would
+			*this = x;             // itself call this member swap function.
 			x     = temp;
 		}
 	}