data(watch): drop invalid sub-1GB storage_options_gb from Huawei 2018 watches

Huawei Watch GT/Magic carried storage_options_gb: [0.125] (128 MB), which is
not a valid integer-GB value: app.validate requires int >= 1 and TechEngine's
MobileDeviceRead rejects the fractional float, breaking the static dump. Remove
the field (the optional storage list) so the records validate and dump cleanly.

Refs #1

Author: Seungpyo1007

data/watch/huawei/2018/huawei-watch-magic/huawei-watch-magic.json

@@ -34,9 +34,6 @@
     "type": "AMOLED capacitive touchscreen, 16M colors",
     "ppi": 326
   },
-  "storage_options_gb": [
-    0.125
-  ],
   "connectivity": {
     "bluetooth": "4.2, LE"
   }