Update application.fam

flipper_pong/application.fam

@@ -3,7 +3,7 @@ App(
     name="Pong",
     apptype=FlipperAppType.EXTERNAL,
     entry_point="flipper_pong_app",
-    cdefines=["APP_PONG_PONG"],
+    cdefines=["APP_FLIPPER_PONG"],
     requires=[
         "gui",
     ],