Add extra JSX case

In JSX, a multi-line call expression should have the normal js
`commentstring`. For example:

```jsx
<div>
  {hello({
    foo: 'bar',
  })}
</div>
```

Commenting the line with `foo: 'bar',` shouldn't use the JSX comment
style.

There are other similar cases that might fail though, for example, a
multi-line array or string, but those are even rarer cases.

Related to #22

Author: JoosepAlviste

lua/ts_context_commentstring/internal.lua

@@ -35,13 +35,17 @@ M.config = {
     jsx_fragment = '{/* %s */}',
     jsx_attribute = '// %s',
     comment = '// %s',
+    call_expression = '// %s',
+    statement_block = '// %s',
   },
   javascript = {
     __default = '// %s',
     jsx_element = '{/* %s */}',
     jsx_fragment = '{/* %s */}',
     jsx_attribute = '// %s',
     comment = '// %s',
+    call_expression = '// %s',
+    statement_block = '// %s',
   },
 }