fdroidcl: fix fragile test

[stefanb]

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---

Fragile test failing found in

• go 1.25.0, go@1.24 1.24.6 (new formula) #226636

  ==> /opt/homebrew/Cellar/fdroidcl/0.8.1/bin/fdroidcl list categories
  Error: fdroidcl: failed
  An exception occurred within a child process:
    Minitest::Assertion: --- expected
  +++ actual
  @@ -1,38 +1,57 @@
   "App Store & Updater
  +Bookmark
   Browser
  +Calculator
   Calendar & Agenda
   Cloud Storage & File Sync
   Connectivity
   DNS & Hosts
   Development
  +Draw
  +Ebook Reader
   Email
   File Encryption & Vault
   File Transfer
  +Finance Manager
  +Gallery
   Games
   Graphics
  +Icon Pack
   Internet
   Keyboard & IME
  +Launcher
   Local Media Player
   Messaging
   Money
   Multimedia
   Navigation
   News
  +Note
   Online Media Player
  +Pass Wallet
   Password & 2FA
   Phone & SMS
   Podcast
  +Public Transport Map & Timetable
   Reading
  +Recipe Manager
   Science & Education
   Security
  +Shopping List
   Social Network
   Sports & Health
   System
  +Task
  +Text Editor
   Theming
   Time
  +Translation & Dictionary
  +Unit Convertor
   VPN & Proxy
   Voice & Video Chat
   Wallet
  +Wallpaper
   Weather
  +Workout
   Writing
   "

This now test just a few prominent categories.