Fix wrong error info in RepoRefForAPI (#24344) (#24351)

Backport #24344 by @yp05327

Co-authored-by: yp05327 <576951401@qq.com>

modules/context/api.go

@@ -337,7 +337,7 @@ func RepoRefForAPI(next http.Handler) http.Handler {
 				if git.IsErrNotExist(err) {
 					ctx.NotFound()
 				} else {
-					ctx.Error(http.StatusInternalServerError, "GetBlobByPath", err)
+					ctx.Error(http.StatusInternalServerError, "GetCommit", err)
 				}
 				return
 			}