build: add v8_embedder_string to build args (#15120)

build/args/all.gn

@@ -4,6 +4,7 @@ root_extra_deps = [ "//electron" ]
 
 v8_promise_internal_field_count = 1
 v8_typed_array_max_size_in_heap = 0
+v8_embedder_string = "-electron.0"
 
 enable_cdm_host_verification = false
 enable_extensions = false