Remove format constraint from frontend/static route

`format` doesn't accept an array. This currently creates a format constraint that looks like this,
and emits a warning because characters appear multiple times in the character class:
`/\A["css", "js", "svg"]\Z/`

The constraint is actually not needed, the controller already handles this.

config/routes.rb

@@ -39,6 +39,6 @@
 
   scope :frontend, controller: :frontends, defaults: { version: GoodJob::VERSION.tr(".", "-") } do
     get "modules/:version/:id", action: :module, as: :frontend_module, constraints: { format: 'js' }
-    get "static/:version/:id", action: :static, as: :frontend_static, constraints: { format: %w[css js svg] }
+    get "static/:version/:id", action: :static, as: :frontend_static
   end
 end