Fix quote is not set in noteserializer

app/lib/activitypub/case_transform.rb

@@ -2,6 +2,11 @@
 
 module ActivityPub::CaseTransform
   class << self
+    NO_CONVERT_VALUES = %w(
+      _misskey_content
+      _misskey_quote
+    ).freeze
+
     def camel_lower_cache
       @camel_lower_cache ||= {}
     end
@@ -12,7 +17,9 @@ module ActivityPub::CaseTransform
       when Hash then value.deep_transform_keys! { |key| camel_lower(key) }
       when Symbol then camel_lower(value.to_s).to_sym
       when String
-        camel_lower_cache[value] ||= if value.start_with?('_:')
+        camel_lower_cache[value] ||= if NO_CONVERT_VALUES.include?(value)
+                                       value
+                                     elsif value.start_with?('_:')
                                        "_:#{value.delete_prefix('_:').underscore.camelize(:lower)}"
                                      else
                                        value.underscore.camelize(:lower)