firmware: sniffer: do not drop maximum-length ATRs

7816-3 8.1/8.2.1 allow TS plus 32 bytes.
atr_i is a byte count, not an index, process_byte_atr() guards its own
store with the same condition before incrementing, so atr_i reaches 33.

Change-Id: Ic8398cbefc0b522946b6470fd0268fa70662dab1

firmware/libcommon/source/sniffer.c

@@ -406,7 +406,7 @@ static void usb_send_atr(uint32_t flags)
 		TRACE_WARNING("Can't print ATR in ISO 7816-3 state %u\n\r", iso_state);
 		return;
 	}
-	if (g_atr.atr_i >= ARRAY_SIZE(g_atr.atr)) {
+	if (g_atr.atr_i > ARRAY_SIZE(g_atr.atr)) {
 		TRACE_ERROR("ATR buffer overflow\n\r");
 		return;
 	}