Maybe let's use `/ORDER BY .forem_forums.\.name ASC/`?

Some builds on travis ci reported as broken and looks like it's because of `to_sql` uses different for different database drivers:
```
 1) Forem::Forum is scoped by default
     Failure/Error: Forem::Forum.all.to_sql.should =~ /ORDER BY \"forem_forums\"\.name ASC/
       expected: /ORDER BY \"forem_forums\"\.name ASC/
            got: "SELECT `forem_forums`.* FROM `forem_forums`   ORDER BY `forem_forums`.name ASC" (using =~)
       Diff:
       @@ -1,2 +1,2 @@
       -/ORDER BY \"forem_forums\"\.name ASC/
       +"SELECT `forem_forums`.* FROM `forem_forums`   ORDER BY `forem_forums`.name ASC"
       
     # ./spec/models/forum_spec.rb:11:in `block (2 levels) in <top (required)>'
```