MS SQL Templates are displayed for PG SQL

[gengelbms]

Issue Type: Bug
MS SQL Templates are shown when users are using PGSQL

Azure Data Studio version: Azure Data Studio 1.6.0 (eb35dae, 2019-04-17T06:14:17.039Z)
OS version: Darwin x64 18.5.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) M-5Y51 CPU @ 1.10GHz (4 x 1200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	2, 2, 2
Memory (System)	8.00GB (0.14GB free)
Process Argv
Screen Reader	no
VM	0%

[akamath46297]

ADS shows PG snippets along with MS SQL snippets. Could we limit this list based on Provider ?