[darwin-framework-tool] Enable leak checking by default if built for …

…mac with ASan disabled (project-chip#36282)

examples/darwin-framework-tool/BUILD.gn

@@ -45,7 +45,7 @@ declare_args() {
   generate_compilation_database = false
 
   # Enable automatic leak checks before the application exits
-  enable_leak_checking = false
+  enable_leak_checking = !is_asan && target_os == "mac"
 }
 
 sdk = "macosx"