Fixup 601c67d

Turns out that commit broke TC on unit images in messages since it broke the equality
check in lua_unit.cpp. Added the XBRZ IPF as part of the Lua unit portrait attribute
instead.

I *think* this is the proper place to do it.

src/scripting/lua_unit.cpp

@@ -364,7 +364,9 @@ static int impl_unit_get(lua_State *L)
 	return_string_attrib("variation", u.variation());
 	return_bool_attrib("zoc", u.get_emit_zoc());
 	return_string_attrib("facing", map_location::write_direction(u.facing()));
-	return_string_attrib("portrait", u.big_profile() == u.absolute_image() ? u.absolute_image() + u.image_mods() : u.big_profile());
+	return_string_attrib("portrait", u.big_profile() == u.absolute_image()
+		? u.absolute_image() + u.image_mods() + "~XBRZ(2)"
+		: u.big_profile());
 	return_cfg_attrib("__cfg", u.write(cfg); u.get_location().write(cfg));
 
 	if(luaW_getmetafield(L, 1, m)) {

src/units/unit.cpp

@@ -1015,7 +1015,7 @@ std::string unit::big_profile() const
 		return profile_;
 	}
 
-	return absolute_image() + "~XBRZ(2)";
+	return absolute_image();
 }
 
 std::string unit::small_profile() const