(GH-1413) Resolve promise correctly in Folding feature (#1416)
(GH-1413) Resolve promise correctly in Folding feature (#1416)

Previously in PR #1414 the Folding provider was updated, however the promise
resolution was incorrect.  This caused the grammar load to never trigger the
Then command.  This commit instead uses the correct way to return the value
for the promise and, when then triggers the Then statement correctly.
PowerShell/vscode-powershell