the terminal is in seprate window, not in the VSCode

Issue Type: Bug

when i open terminal in VSCode, it's in seprate window, not intergrate in VSCode, even if i set Terminal launch type to integrated

Extension version: 0.0.10
VS Code version: Code 1.38.0 (3db7e09f3b61f915d03bbfa58e258d6eee843f35, 2019-09-03T21:49:13.459Z)
OS version: Windows_NT x64 10.0.18362

System Info

|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz (8 x 3392)|
|GPU Status|2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
native_gpu_memory_buffers: disabled_software
oop_rasterization: disabled_off
protected_video_decode: unavailable_off
rasterization: enabled
skia_deferred_display_list: disabled_off
skia_renderer: disabled_off
surface_synchronization: enabled_on
video_decode: enabled
viz_display_compositor: disabled_off
webgl: enabled
webgl2: enabled|
|Load (avg)|undefined|
|Memory (System)|11.91GB (2.25GB free)|
|Process Argv||
|Screen Reader|no|
|VM|0%|

Start by reproducing the terminal launch behavior with Extension version 0.0.10 on VS Code 1.38.0 under Windows 10, using the reported integrated-terminal setting. No source files, tests, or entry points are identified in the issue; done means the terminal opens inside VS Code rather than in a separate window.

Written by the indexing model from the issue text.