fixup! AvailabilityPeriod for topic consumers (#24752)

Author: ubyte

ydb/public/api/protos/ydb_topic.proto

@@ -6,7 +6,6 @@ import "ydb/public/api/protos/ydb_issue_message.proto";
 import "ydb/public/api/protos/annotations/sensitive.proto";
 import "ydb/public/api/protos/annotations/validation.proto";
 
-import "google/protobuf/empty.proto";
 import "google/protobuf/duration.proto";
 import "google/protobuf/empty.proto";
 import "google/protobuf/timestamp.proto";