Hotfix for "Add time manually" (https://github.com/go-gitea/gitea/pull/2211#issuecomment-328780125) (#2499)

Signed-off-by: Jonas Franz <info@jonasfranz.software>

routers/repo/issue_timetrack.go

@@ -41,7 +41,7 @@ func AddTimeManually(c *context.Context, form auth.AddTimeManuallyForm) {
 		return
 	}
 
-	if _, err := models.AddTime(c.User, issue, int64(total)); err != nil {
+	if _, err := models.AddTime(c.User, issue, int64(total.Seconds())); err != nil {
 		c.Handle(http.StatusInternalServerError, "AddTime", err)
 		return
 	}