command_handler: change 'cmd_ctx' to CMD_CTX

Convert all command handler 'cmd_ctx' parameter usage with CMD_CTX.

src/server/gdb_server.c

@@ -2252,7 +2252,7 @@ COMMAND_HANDLER(handle_gdb_sync_command)
 
 	if (current_gdb_connection == NULL)
 	{
-		command_print(cmd_ctx,
+		command_print(CMD_CTX,
 				"gdb_sync command can only be run from within gdb using \"monitor gdb_sync\"");
 		return ERROR_FAIL;
 	}

src/server/server.c

@@ -553,7 +553,7 @@ SERVER_PORT_COMMAND()
 {
 	switch (CMD_ARGC) {
 	case 0:
-		command_print(cmd_ctx, "%d", *out);
+		command_print(CMD_CTX, "%d", *out);
 		break;
 	case 1:
 	{