Fix git hooks update to receive required arguments. Fixes #2090 (#2095)

* Changed migration calling so that migrations can use models package

models/migrations/v36.go

@@ -0,0 +1,15 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package migrations
+
+import (
+	"code.gitea.io/gitea/models"
+
+	"github.com/go-xorm/xorm"
+)
+
+func regenerateGitHooks36(x *xorm.Engine) (err error) {
+	return models.SyncRepositoryHooks()
+}