Honor DEFAULT_PAGING_NUM for API (#11805) (#11813)

* Honor DEFAULT_PAGING_NUM for API

* set pagination to 10 for tests

* lint

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
(cherry picked from commit cefbf73aea)

modules/convert/utils.go

@@ -11,7 +11,7 @@ import (
 // ToCorrectPageSize makes sure page size is in allowed range.
 func ToCorrectPageSize(size int) int {
 	if size <= 0 {
-		size = 10
+		size = setting.API.DefaultPagingNum
 	} else if size > setting.API.MaxResponseItems {
 		size = setting.API.MaxResponseItems
 	}