Revert "Set droid's gid 1000"

This reverts commit de2d3330246d61dfcb08164f7e2f9f53ffc99517.

Reason for revert: it breaks ttyd(no group of which gid is 1000)

Change-Id: Ic14d8f38d44f3bf8c8dc29f47a18f0a0b92fb4d8
diff --git a/build/debian/fai_config/scripts/AVF/20-useradd b/build/debian/fai_config/scripts/AVF/20-useradd
index b5887c5..9fbcd43 100755
--- a/build/debian/fai_config/scripts/AVF/20-useradd
+++ b/build/debian/fai_config/scripts/AVF/20-useradd
@@ -1,4 +1,4 @@
 #!/bin/bash
 
-$ROOTCMD useradd -m -u 1000 -g 1000 -N -G sudo droid
+$ROOTCMD useradd -m -u 1000 -N -G sudo droid
 $ROOTCMD echo 'droid ALL=(ALL) NOPASSWD:ALL' >> $target/etc/sudoers
\ No newline at end of file