Set wayland app_id

[DownerCase]

Thanks to this mod, its possible to run minecraft natively on Wayland, however it does not set the app_id, the identifier for windows spawned by an application. Setting this allows Wayland compositors to apply rules to windows (in my case I wanted minecraft to always be floating, not tiled).

This PR simply sets the Wayland app_id via GLFW. The window hint is ignored by other platforms, same as for the X11 and Cocoa hints.

Output from swaymsg -t get_tree (which shows information about the current windows)
Before (minecraft has no app_id, but prism does):

#6: workspace "1"
    #31: con "Prism Launcher 9.1" (xdg_shell, pid: 172749, app_id: "org.prismlauncher.PrismLauncher")
    #32: con "Console window for GT_New_Horizons_2.7.1_Java_17-21 — Prism Launcher 9.1" (xdg_shell, pid: 172749, app_id: "org.prismlauncher.PrismLauncher")
    #47: floating_con "GT: New Horizons 2.7.1" (xdg_shell, pid: 236404)

After (minecraft has the app_id "minecraft"):

#6: workspace "1"
    #31: con "Prism Launcher 9.1" (xdg_shell, pid: 172749, app_id: "org.prismlauncher.PrismLauncher")
    #32: con "Console window for GT_New_Horizons_2.7.1_Java_17-21 — Prism Launcher 9.1" (xdg_shell, pid: 172749, app_id: "org.prismlauncher.PrismLauncher")
    #57: floating_con "GT: New Horizons 2.7.1" (xdg_shell, pid: 268388, app_id: "minecraft")

Tested locally, and now sway is able to make my game window float for me on load 😄

Ps: I did the gradlew updateBuildScript thing because otherwise the build was failing on spotless. I don't understand why, Java development is totally new to me, but that's why those changes are in this too... 🙃