provide RESTART button in script update confirmation dialog

[ngwese]

in #202 confirmation dialogs were added to update (single) and update all operations within maiden's project manager ui. when scripts containing engine files are first installed and/or updated it is important to restart the norns stack (particularly supercollider) in order to see the changes.

installing/updating scripts and then having them fail on run (because engines are missing or out of date) is a frequent pain point for people.

it was suggested as part of the review to consider adding a restart button directly in the maiden confirmation dialogs to make it easier on folks - performing the restart in maiden has the added benefit of ensuring that the repl(s) get reconnected.

/cc @dndrks