Bash is the default shell

Bug: 375326807
Test: check the shell in the terminal
Change-Id: I4933d9e2a866fedb544240fb4abf9edec5536f9c
diff --git a/build/debian/fai_config/scripts/AVF/20-useradd b/build/debian/fai_config/scripts/AVF/20-useradd
index 9fbcd43..1c93772 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
 
-$ROOTCMD useradd -m -u 1000 -N -G sudo droid
-$ROOTCMD echo 'droid ALL=(ALL) NOPASSWD:ALL' >> $target/etc/sudoers
\ No newline at end of file
+$ROOTCMD useradd -m -u 1000 -N -G sudo -s /usr/bin/bash droid
+$ROOTCMD echo 'droid ALL=(ALL) NOPASSWD:ALL' >> $target/etc/sudoers