cli: remove RUNNING field from default 'common' fields

That way it is not displayed by default:
$ nmcli general status

But can be explicitly requested:
$ nmcli -t -f running,version general status
$ nmcli -f all general status

E.g. Fedora initscripts do this in
/etc/sysconfig/network-scripts/network-functions

is_nm_running ()
{
    [ "$(LANG=C nmcli -t --fields running nm status 2>/dev/null)" = "running" ]
}

cli/src/network-manager.c

@@ -55,7 +55,7 @@ static NmcOutputField nmc_fields_nm_status[] = {
 #define NMC_FIELDS_NM_STATUS_SWITCH  "NETWORKING,WIFI-HW,WIFI,WWAN-HW,WWAN"
 #define NMC_FIELDS_NM_STATUS_RADIO   "WIFI-HW,WIFI,WWAN-HW,WWAN"
 #endif
-#define NMC_FIELDS_NM_STATUS_COMMON  "RUNNING,STATE,WIFI-HW,WIFI,WWAN-HW,WWAN"
+#define NMC_FIELDS_NM_STATUS_COMMON  "STATE,WIFI-HW,WIFI,WWAN-HW,WWAN"
 #define NMC_FIELDS_NM_NETWORKING     "NETWORKING"
 #define NMC_FIELDS_NM_WIFI           "WIFI"
 #define NMC_FIELDS_NM_WWAN           "WWAN"