cli,nas: S/N ratio is dB, not dBm

Reported by: <ebiegler@gmx.de>
diff --git a/src/qmicli/qmicli-nas.c b/src/qmicli/qmicli-nas.c
index 57d676b..2db3427 100644
--- a/src/qmicli/qmicli-nas.c
+++ b/src/qmicli/qmicli-nas.c
@@ -297,7 +297,7 @@
                  "\tRSSI: '%d dBm'\n"
                  "\tRSRQ: '%d dB'\n"
                  "\tRSRP: '%d dBm'\n"
-                 "\tSNR: '%.1lf dBm'\n",
+                 "\tSNR: '%.1lf dB'\n",
                  rssi,
                  rsrq,
                  rsrp,