Move flatpak remote setup to first boot

services/flatpak-first-boot.service

@@ -8,6 +8,7 @@ ConditionPathExists=!/var/lib/flatpak/.firstboot-done
 Type=oneshot
 RemainAfterExit=yes
 ExecStart=/bin/bash -c '\
+    flatpak remote-add --if-not-exists --system flathub https://dl.flathub.org/repo/flathub.flatpakrepo && \
     flatpak install -y --system flathub runtime/org.gnome.Platform/x86_64/49 && \
     flatpak install -y --system flathub io.github.kolunmi.Bazaar && \
     touch /var/lib/flatpak/.firstboot-done'