[Bug][Jupyter Widget] Height setting is not effective in html file

**Describe the bug**
When export and view an html file, the height setting becomes the default.

**To Reproduce**
1. load kepler
2. Add data & config
3. Export html map

**Expected behavior**
Even if code it like this, the height will be 400.
map1 = KeplerGl(height=800)

**Screenshots**
none

**Environment (please complete the following information):**
- Python version: python3
- keplergl Widget version 0.3.4~0.3.7