fix(electron): "::" address causes blank local display

When config.address is set to "::" (listen on all interfaces), the
Electron window tries to load http://:::8080 instead of
http://localhost:8080, resulting in a blank local display.

The remap that converts wildcard bind addresses to "localhost" for the
Electron loadURL call already handled undefined, "", and "0.0.0.0",
but was missing "::". Add it.

Author: Mike Bishop

js/electron.js

@@ -100,7 +100,7 @@ function createWindow () {
 		prefix = "http://";
 	}
 
-	let address = (config.address === void 0) | (config.address === "") | (config.address === "0.0.0.0") ? (config.address = "localhost") : config.address;
+	let address = (config.address === void 0) | (config.address === "") | (config.address === "0.0.0.0") | (config.address === "::") ? (config.address = "localhost") : config.address;
 	const port = process.env.MM_PORT || config.port;
 	mainWindow.loadURL(`${prefix}${address}:${port}`);