Fix &isk not applying when editing SASS/SCSS

ftplugin/sass.vim

@@ -16,7 +16,7 @@ setlocal commentstring=//\ %s
 setlocal includeexpr=SassIncludeExpr(v:fname)
 setlocal omnifunc=csscomplete#CompleteCSS
 setlocal suffixesadd=.sass,.scss,.css
-if &filetype =~# '\<s[ac]ss]\>'
+if &filetype =~# '\<s[ac]ss\>'
   setlocal iskeyword+=-
   setlocal iskeyword+=$
   setlocal iskeyword+=%

syntax/sass.vim

@@ -100,7 +100,6 @@ hi def link sassInterpolationDelimiter  Delimiter
 hi def link sassAmpersand               Character
 hi def link sassId                      Identifier
 hi def link sassClass                   Type
-hi def link sassMixinName               Function
 
 let b:current_syntax = "sass"