build: [gn] fix resource path conflict on mac (#13824)

BUILD.gn

@@ -368,7 +368,7 @@ static_library("electron_lib") {
 
 electron_paks("packed_resources") {
   if (is_mac) {
-    output_dir = "$root_gen_dir/repack"
+    output_dir = "$root_gen_dir/electron_repack"
     copy_data_to_bundle = true
   } else {
     output_dir = root_out_dir