Corrects command/flags used in ruby interop tests

src/ruby/bin/interop/interop_client.rb

@@ -277,13 +277,13 @@ class NamedTests
     p 'OK: cancel_after_begin'
   end
 
-  def cancel_after_first
+  def cancel_after_first_response
     msg_sizes = [[27_182, 31_415], [8, 9], [1828, 2653], [45_904, 58_979]]
     ppp = PingPongPlayer.new(msg_sizes)
     op = @stub.full_duplex_call(ppp.each_item, return_op: true)
     ppp.canceller_op = op  # causes ppp to cancel after the 1st message
     assert_raises(GRPC::Cancelled) { op.execute.each { |r| ppp.queue.push(r) } }
-    p 'OK: cancel_after_first'
+    p 'OK: cancel_after_first_response'
   end
 
   def all

tools/gce_setup/grpc_docker.sh

@@ -1173,7 +1173,6 @@ grpc_cloud_prod_auth_jwt_token_creds_gen_ruby_cmd() {
   local test_script="/var/local/git/grpc/src/ruby/bin/interop/interop_client.rb"
   local test_script+=" --use_tls"
   local gfe_flags=$(_grpc_prod_gfe_flags)
-  local added_gfe_flags=$(_grpc_jwt_token_test_flags)
   local env_prefix="SSL_CERT_FILE=/cacerts/roots.pem"
   env_prefix+=" GOOGLE_APPLICATION_CREDENTIALS=/service_account/stubbyCloudTestingTest-7dd63462c60c.json"
   local the_cmd="$cmd_prefix '$env_prefix ruby $test_script $gfe_flags $added_gfe_flags $@'"