fix(install_upgrade): remove `vm_args` backup in `install`

The `install_upgrade.escript` depended on being able to retrieve the
`vm_args` argument from `init`, but that options has been removed
recently.  Since this backup was unused, we also remove it here.

bin/install_upgrade.escript

@@ -248,10 +248,6 @@ parse_version(V) when is_list(V) ->
     hd(string:tokens(V,"/")).
 
 check_and_install(TargetNode, Vsn) ->
-    %% Backup the vm.args. VM args should be unchanged during hot upgrade
-    %% but we still backup it here
-    {ok, [[CurrVmArgs]]} = rpc:call(TargetNode, init, get_argument, [vm_args], ?TIMEOUT),
-    {ok, _} = file:copy(CurrVmArgs, filename:join(["releases", Vsn, "vm.args"])),
     %% Backup the sys.config, this will be used when we check and install release
     %% NOTE: We cannot backup the old sys.config directly, because the
     %% configs for plugins are only in app-envs, not in the old sys.config