fix(windows): re-add leading double brace to AppId

Author: ErikBjare

scripts/package/activitywatch-setup.iss

@@ -14,7 +14,8 @@
 [Setup]
 ; NOTE: The value of AppId uniquely identifies this application. Do not use the same AppId value in installers for other applications.
 ; (To generate a new GUID, click Tools | Generate GUID inside the IDE.)
-AppId={F226B8F4-3244-46E6-901D-0CE8035423E4}
+; NOTE: the double {{ are used to escape the { character (needed for the AppId)
+AppId={{F226B8F4-3244-46E6-901D-0CE8035423E4}
 AppName={#MyAppName}
 AppVersion={#MyAppVersion}
 ;AppVerName={#MyAppName} {#MyAppVersion}