server : allow setting --reverse-prompt arg (#14799)

Signed-off-by: Molly Sophia <mollysophia379@gmail.com>

tools/server/server.cpp

@@ -253,6 +253,7 @@ struct server_task {
         defaults.sampling    = params_base.sampling;
         defaults.speculative = params_base.speculative;
         defaults.n_keep      = params_base.n_keep;
+        defaults.antiprompt  = params_base.antiprompt;
 
         // enabling this will output extra debug information in the HTTP responses from the server
         params.verbose           = params_base.verbosity > 9;
@@ -490,6 +491,10 @@ struct server_task {
                     }
                 }
             }
+            // set reverse prompt from cli args if not set in the request
+            if (params.antiprompt.empty()) {
+                params.antiprompt = defaults.antiprompt;
+            }
         }
 
         {