[cmdline] Always clear screen after reconfiguring console

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/hci/commands/console_cmd.c

 #include <ipxe/console.h>
 #include <ipxe/image.h>
 #include <ipxe/pixbuf.h>
+#include <ipxe/ansiesc.h>
 #include <ipxe/ansicol.h>
 #include <usr/imgmgmt.h>
 
 		goto err_configure;
 	}
 
+	/* Reapply default colour pair and clear screen */
+	ansicol_set_pair ( CPAIR_DEFAULT );
+	printf ( CSI "2J" CSI "H" );
+
  err_configure:
 	pixbuf_put ( opts.config.pixbuf );
  err_pixbuf: