tools: fix frr-reload route-map desc cmd

tools: fix frr-reload route-map desc cmd

Fix frr-reload script to only render 'no description'
rather than 'no description blah'

Ticket:#3650752
Testing:

route-map TEST permit 140
 description rule for PFIX_IPV6_7
 match ipv6 address prefix-list PFIX_IPV6_7
exit
!
end

torc-11# confi t
torc-11(config)# route-map TEST permit 140
torc-11(config-route-map)# no description rule for PFIX_IPV6_7
% Unknown command: no description rule for PFIX_IPV6_7

torc-11(config-route-map)# no description rule
% There is no matched command.
torc-11(config-route-map)# no description
  <cr>
torc-11(config-route-map)# no description
torc-11(config-route-map)#

Using frr-reload failure log:
2023-10-31 00:30:31,972  INFO: Failed to execute route-map TEST permit 140  no description rule for PFIX_IPV6_7 exit
2023-10-31 00:30:31,972 ERROR: "route-map TEST permit 140 --  no description rule for PFIX_IPV6_7 -- exit" we failed to remove this command
2023-10-31 00:30:31,972 ERROR: % Unknown command:  no description rule for PFIX_IPV6_7

With fix:

2023-11-02 06:10:30,024  INFO: Executed "route-map TEST permit 140  no description exit"

Signed-off-by: Chirag Shah <chirag@nvidia.com>
(cherry picked from commit 989991cf3cc24e673af627f4049e7e55077d31ec)