Minor cleanup

classes/backlight/arc_widget.lua

@@ -1,4 +1,5 @@
 local P = {}
+P.__index = P
 
 function P:set_value(value)
 	-- Set widget value. (0 - 100)
@@ -30,7 +31,6 @@ end
 function P:new()
 	local widget = {}
 	setmetatable(widget, self)
-	self.__index = self
 
 	widget.icon = wibox.widget {
 		id = "icon",

classes/backlight/backlight.lua

@@ -5,7 +5,7 @@ local widget_types = {
 local P = {
 	name = "backlight"
 }
-
+P.__index = P
 
 ---
 -- Internal methods
@@ -101,7 +101,6 @@ function P:new(args)
 		-- do nothing. Updated in _get_status()
 	}
 	setmetatable(b, self)
-	self.__index = self
 
 	b.widget = widget_types[b.widget_type]:new()