Inproper hashtable collapsing

[andrzejdz]

System Details

### VSCode version: 1.29.1 bc24f98b5f70467bc689abf41cc5550ca637088e x64

### VSCode extensions:
donjayamanne.githistory@0.4.4
ms-mssql.mssql@1.4.0
ms-vscode.PowerShell@1.10.1
sadeghpm.sql-snippets@0.0.4


### PSES version: 1.10.1.0

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      5.1.17134.407
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.17134.407
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Issue Description

I am experiencing a problem with hashtable collapsing.

Actual Behaviour

During hashtable collapsing, signs '@{' seams to be ignored.

[TylerLeonhardt]

This is a dupe of #1631 there's currently an active PR to fix it:

PowerShell/PowerShellEditorServices#805