altair-lte: don't use send-delay=0

On the modem with firmware revision ALT3100_04_05_06_10_A8_TF
(LTEUSB_02_04_05_10_53), it's observed that port probing doesn't
complete successfully when send-delay=0 is used.

plugins/altair/mm-plugin-altair-lte.c

@@ -83,7 +83,6 @@ mm_plugin_create (void)
                       MM_PLUGIN_CUSTOM_AT_PROBE,     custom_at_probe,
                       MM_PLUGIN_ALLOWED_SINGLE_AT,   TRUE,
                       MM_PLUGIN_SEND_LF,             TRUE,
-                      MM_PLUGIN_SEND_DELAY,          0,
                       NULL));
 }