[flutter_tools] Avoid duplicated calls to l10n generation (#76066)

diff --git a/AUTHORS b/AUTHORS
index f43f4d1..5816fad 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -74,3 +74,4 @@
 vimerzhao <vimerzhao@gmail.com>
 Pedro Massango <pedromassango.developer@gmail.com>
 Hidenori Matsubayashi <Hidenori.Matsubayashi@sony.com>
+Perqin Xie <perqinxie@gmail.com>