configs/wrs_release_defconfig: use empty password by default

Revert part of a commit:
f14e28c9

 Setup default config for the switch (WR profile by default)

Signed-off-by: Adam Wujek <adam.wujek@cern.ch>

configs/wrs_release_defconfig

@@ -24,8 +24,7 @@ CONFIG_HOSTNAME_DHCP=y
 #
 # Root Password
 #
-CONFIG_ROOT_PWD_IS_ENCRYPTED=y
-CONFIG_ROOT_PWD_CYPHER="$1$YSMM6Ch4$qlAct1hjJNtYuw3CZzY0M1"
+# CONFIG_ROOT_PWD_IS_ENCRYPTED is not set
 CONFIG_ROOT_PWD_CLEAR=""
 CONFIG_NTP_SERVER=""
 CONFIG_DNS_SERVER=""