beautiful: drop getimage()

Signed-off-by: Julien Danjou <julien@danjou.info>

awesomerc.lua.in

@@ -382,7 +382,7 @@ end)
 awful.hooks.arrange.register(function (screen)
     local layout = awful.layout.get(screen)
     if layout then
-        mylayoutbox[screen].image = beautiful.getimage("layout_" .. layout)
+        mylayoutbox[screen].image = image(beautiful["layout_" .. layout])
     else
         mylayoutbox[screen].image = nil
     end

lib/beautiful.lua.in

@@ -87,17 +87,6 @@ function init(path)
     end
 end
 
---- Return an image from the theme.
--- @param imgspec Name of the image key.
--- @return The image.
-function getimage(imgspec)
-    if theme[imgspec] then
-        return capi.image(theme[imgspec])
-    else
-        return nil
-    end
-end
-
 setmetatable(package.loaded[module_name], package.loaded[module_name])
 
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