Fix locals not being passed to child groups

src/spectator/dsl/structure_dsl.cr

@@ -167,7 +167,7 @@ module Spectator
         end
 
         class Factory%example < ::Spectator::ExampleFactory
-          def build(locals = {} of Symbol => ValueWrapper)
+          def build(locals : Hash(Symbol, ValueWrapper))
             Example%example.new(locals)
           end
         end

src/spectator/example_factory.cr

@@ -1,5 +1,5 @@
 module Spectator
   abstract class ExampleFactory
-    abstract def build : Example
+    abstract def build(locals : Hash(Symbol, ValueWrapper)) : Example
   end
 end

src/spectator/example_group.cr

@@ -42,7 +42,7 @@ module Spectator
           if child.is_a?(ExampleFactory)
             array << child.build(locals)
           else
-            array.concat(child.all_examples)
+            array.concat(child.all_examples(locals))
           end
         end
       end