Fix disabled mods still being loaded

The format of mod-list.json written on syncMods would incorrectly write
a base mod without an enableds key which is required, causing Factorio
to ignore the file entirerly.  Furthermore the enabled status was not
written causing all mods to be loaded even if they were disabled in the
mod pack.

packages/slave/src/Instance.js

@@ -649,7 +649,7 @@ rcon.print(game.table_to_json(players))`.replace(/\r?\n/g, " ");
 
 		// Write mod-list.json
 		await fs.outputFile(this.path("mods", "mod-list.json"), JSON.stringify({
-			mods: [{ name: "base" }, ...this.activeModPack.mods.values()].map(m => ({ name: m.name, enabled: true })),
+			mods: [...this.activeModPack.mods.values()],
 		}, null, 2));
 
 		// Write mod-settings.dat