vendor: downgrade NW.js back to 0.55.0

The 0.56.0 Windows build is broken, so temporarily downgrade again.

- nwjs/nw.js@90bb200
- nwjs/node@3ae56e4

CHANGELOG.md

@@ -9,7 +9,7 @@ Changelog - Streamlink Twitch GUI
 - Fixed HTML tags being escaped in translations
 - Fixed Windows uninstaller not removing some directories
 - Fixed French translations ([#826](https://github.com/streamlink/streamlink-twitch-gui/pull/826))
-- Upgraded NW.js to 0.56.0 (Chromium 93.0.4577.63 / NodeJS 16.4.2)
+- Upgraded NW.js to 0.55.0 (Chromium 92.0.4515.107 / NodeJS 16.4.2)
 
 
 [Changelog](https://github.com/streamlink/streamlink-twitch-gui/compare/v1.12.0...master)

src/config/main.json

@@ -1,7 +1,7 @@
 {
 	"display-name": "Streamlink Twitch GUI",
 	"app-identifier": "streamlink-twitch-gui",
-	"nwjs-version": "0.56.0",
+	"nwjs-version": "0.55.0",
 	"urls": {
 		"homepage": "https://github.com/streamlink/streamlink-twitch-gui",
 		"release": "https://github.com/streamlink/streamlink-twitch-gui/releases/tag/v{version}",