wwan: json format in some modem definitions

Method used:
```
cd package/network/utils/wwan/files/data
sed -e 's/}}/}/g' -i *
sed -e 's/}\t"acm": 1/\t"acm": 1/g' -i *
sed -e 's/}\t"generic": 1/\t"generic": 1/g' -i *
```

Manually adjusted commas.
Validated with
```
for f in `ls` ; do echo $f ; python -m json.tool < $f || break ; done
```

Thanks to @lynxis for pointing out the commas.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

package/network/utils/wwan/files/data/19d2-0064

@@ -2,4 +2,4 @@
 	"desc": "ZTE MF627",
 	"control": 0,
 	"data": 2
-}}
+}