Meta: Don't run qemu as root

This currently only supports Linux but I don't think anyone else
ran this yet because they'd have run into the E1000 bug I fixed
in SerenityOS#6669

Meta/run.sh

@@ -105,14 +105,16 @@ elif [ "$SERENITY_RUN" = "qn" ]; then
  -append "${SERENITY_KERNEL_CMDLINE}"
 elif [ "$SERENITY_RUN" = "qtap" ]; then
  # Meta/run.sh qtap: qemu with tap
- sudo "$SERENITY_QEMU_BIN" \
+ sudo ip tuntap add dev tap0 mode tap user "$(id -u)"
+ "$SERENITY_QEMU_BIN" \
  $SERENITY_COMMON_QEMU_ARGS \
  $SERENITY_VIRT_TECH_ARG \
  $SERENITY_PACKET_LOGGING_ARG \
  -netdev tap,ifname=tap0,id=br0 \
  -device e1000,netdev=br0 \
  -kernel Kernel/Kernel \
  -append "${SERENITY_KERNEL_CMDLINE}"
+ sudo ip tuntap del dev tap0 mode tap
 elif [ "$SERENITY_RUN" = "qgrub" ]; then
  # Meta/run.sh qgrub: qemu with grub
  "$SERENITY_QEMU_BIN" \