cli,firmware: fix reporting fastboot AT command

The update method is a bitmask, so check for the flag.

cli/mmcli-modem-firmware.c

@@ -159,13 +159,8 @@ print_firmware_status (void)
             version = mm_firmware_update_settings_get_version (update_settings);
         }
 
-        switch (m) {
-        case MM_MODEM_FIRMWARE_UPDATE_METHOD_FASTBOOT:
+        if (m & MM_MODEM_FIRMWARE_UPDATE_METHOD_FASTBOOT)
             fastboot_at = mm_firmware_update_settings_get_fastboot_at (update_settings);
-            break;
-        default:
-            break;
-        }
     }
 
     /* There's not much to print in this status info, and if the modem