fix: Mangle _listeners as __l instead of l (#4463)

Author: rschristian

mangle.json

@@ -26,7 +26,7 @@
     "cname": 6,
     "props": {
       "$_hasScuFromHooks": "__f",
-      "$_listeners": "l",
+      "$_listeners": "__l",
       "$_cleanup": "__c",
       "$__hooks": "__H",
       "$_hydrationMismatch": "__m",