fix:fix: throw on weitht passed to CSS3 invert()

Author: nschonni

spec/core_functions/color/invert.hrx

@@ -158,11 +158,6 @@ Error: wrong number of arguments (3 for 2) for `invert'
 
 <===>
 ================================================================================
-<===> error/number_with_weight/options.yml
----
-:todo:
-- sass/libsass#2899
-
 <===> error/number_with_weight/input.scss
 a {b: invert(1, 50%)}