Fix 32955 to support `=` within the query condition

```
{{#ask: [[Has url::http://example.org/api.php?action=Foo]]
 |?Has url=URL
 |limit=3
}}
```
https://bugzilla.wikimedia.org/show_bug.cgi?id=32955
https://bugzilla.wikimedia.org/show_bug.cgi?id=36351