samples: nrf9160: modem_shell: LTE connected to LED#3

LTE connected LED changed from #1 to #3.
This enables of showing blue LED when connected to LTE
in Thingy instead a default red and no need to separate DTS overlay.

Signed-off-by: Jani Hirsimäki <[email protected]>

Author: jhirsi

samples/nrf9160/modem_shell/README.rst

@@ -697,7 +697,7 @@ LED indications
 
 The LEDs have the following functions:
 
-LED 1:
+LED 3 (nRF9160 DK)/Blue LED (Thingy:91):
    Indicates the LTE registration status.
 
 Testing

samples/nrf9160/modem_shell/src/link/link.c

@@ -48,7 +48,7 @@ struct pdn_activation_status_info {
 	uint8_t cid;
 };
 
-#define REGISTERED_STATUS_LED          DK_LED1
+#define REGISTERED_STATUS_LED          DK_LED3
 
 static bool link_subscribe_for_rsrp;