#2132 - Replace all uses of foo_callback with foo

ale_linters/html/htmlhint.vim

@@ -24,9 +24,9 @@ endfunction
 
 call ale#linter#Define('html', {
 \   'name': 'htmlhint',
-\   'executable_callback': ale#node#FindExecutableFunc('html_htmlhint', [
+\   'executable': {b -> ale#node#FindExecutable(b, 'html_htmlhint', [
 \       'node_modules/.bin/htmlhint',
-\   ]),
-\   'command_callback': 'ale_linters#html#htmlhint#GetCommand',
+\   ])},
+\   'command': function('ale_linters#html#htmlhint#GetCommand'),
 \   'callback': 'ale#handlers#unix#HandleAsError',
 \})