Update firefox appstream metainfo

[malfisya]

Please confirm there isn't an existing open bug report

• [X] I have searched open bugs for this issue

Summary

I think firefox metainfo should be updated. At the very least the screenshot is not representative anymore.

Steps to reproduce

Open GS or Discover, search firefox. Check the page

Expected result

Actual result

Environment

• [X] Is system up to date?

Repo

Unstable

Desktop Environment

GNOME

System details

System: Host: desktop-solus Kernel: 6.6.22-281.current arch: x86_64 bits: 64 Desktop: GNOME v: 45.5 Distro: Solus 4.5 resilience Machine: Type: Desktop Mobo: Wibtek model: H77-M v: V1.3 serial: BIOS: American Megatrends v: 4.6.5 date: 09/03/2012 CPU: Info: quad core Intel Core i5-3570K [MCP] speed (MHz): avg: 3220 min/max: 1600/3800 Graphics: Device-1: Intel IvyBridge GT2 [HD Graphics 4000] driver: i915 v: kernel Device-2: AMD Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] driver: amdgpu v: kernel Device-3: Jieli USB PHY 2.0 driver: snd-usb-audio,uvcvideo type: USB Display: wayland server: X.Org v: 23.2.4 with: Xwayland v: 23.2.4 compositor: gnome-shell driver: gpu: amdgpu,i915 resolution: 1: 1366x768~60Hz 2: 1366x768~60Hz API: OpenGL v: 4.6 compat-v: 4.2 vendor: amd mesa v: 24.0.3 renderer: AMD Radeon RX 550 / 550 Series (radeonsi polaris12 LLVM 16.0.6 DRM 3.54 6.6.22-281.current) Network: Device-1: Realtek RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet driver: r8169 Device-2: Realtek RTL8188EUS 802.11n Wireless Network Adapter driver: rtl8xxxu type: USB Drives: Local Storage: total: 700.51 GiB used: 326 GiB (46.5%) Info: Memory: total: 16 GiB available: 15.53 GiB used: 4.53 GiB (29.2%) Processes: 279 Uptime: 26m Shell: fish inxi: 3.3.33

Other comments

We can use firefox flatpak one with little modification https://hg.mozilla.org/mozilla-central/file/tip/taskcluster/docker/firefox-flatpak/org.mozilla.firefox.appdata.xml.in