#2132 - Replace all uses of foo_callback with foo

ale_linters/javascript/jshint.vim

@@ -25,9 +25,9 @@ endfunction
 
 call ale#linter#Define('javascript', {
 \   'name': 'jshint',
-\   'executable_callback': ale#node#FindExecutableFunc('javascript_jshint', [
+\   'executable': {b -> ale#node#FindExecutable(b, 'javascript_jshint', [
 \       'node_modules/.bin/jshint',
-\   ]),
-\   'command_callback': 'ale_linters#javascript#jshint#GetCommand',
+\   ])},
+\   'command': function('ale_linters#javascript#jshint#GetCommand'),
 \   'callback': 'ale#handlers#unix#HandleAsError',
 \})