Ignore function default values in snippets

[BernieWhite]

Description of the issue

Azure template functions are not valid in parameter files.

When Azure templates has a default value such as [resourceGroup.location] this should not be included in the parameter file snippet since it is not valid.

Expected behaviour

Exclude parameters with a default value of a function in parameter file snippet.

Module in use and version:

• Module: PSDocs.Azure
• Version: 0.4.0-B2107004

Captured output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      7.1.3
PSEdition                      Core
GitCommitId                    7.1.3
OS                             Microsoft Windows 10.0.19043
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0