fix(zprofile): export DISPLAY=:0 for XWayland before exec sway

Sway's XWayland is lazy — DISPLAY isn't set in sway's env until the
first X client connects, which means systemctl/dbus import-environment
runs too early and nothing downstream sees DISPLAY.

Setting DISPLAY=:0 in zprofile before 'exec sway' ensures sway itself
inherits it, and therefore so do all its child processes (terminals,
scripts, systemd user services via import-environment). XWayland will
spawn on demand when a client actually connects to :0.

Also drop the redundant fallback from rqr now that the session-wide
export covers it.

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