Fix comment permissions (#28213)

This PR will fix some missed checks for private repositories' data on
web routes and API routes.

routers/api/v1/user/gpg_key.go

@@ -112,7 +112,7 @@ func GetGPGKey(ctx *context.APIContext) {
 	//   "404":
 	//     "$ref": "#/responses/notFound"
 
-	key, err := asymkey_model.GetGPGKeyByID(ctx, ctx.ParamsInt64(":id"))
+	key, err := asymkey_model.GetGPGKeyForUserByID(ctx, ctx.Doer.ID, ctx.ParamsInt64(":id"))
 	if err != nil {
 		if asymkey_model.IsErrGPGKeyNotExist(err) {
 			ctx.NotFound()