Indentation inconsistent when using more than 1 line continuation

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• Make sure you are able to repro it on the latest released version
• Perform a quick search for existing issues to check if this bug has already been reported

Steps to reproduce

Execute the following script & compare the formatted output to the input (as defined by the variable $scriptDefinition)

$scriptDefinition = @'
$all_links = `
    [array](Get-ChildItem -Path ([Environment]::GetFolderPath('StartMenu')) -Recurse -Include '*.lnk') + `
    (Get-ChildItem -Path ([Environment]::GetFolderPath('CommonStartMenu')) -Recurse -Include '*.lnk')
'@

Invoke-Formatter -ScriptDefinition $scriptDefinition

Expected behavior

The output of the call to Invoke-Formatter should be the same as the input.

Actual behavior

The third line of the output is not indented to the same level as the second line - the output of Invoke-Formatter is as shown below.

$all_links = `
    [array](Get-ChildItem -Path ([Environment]::GetFolderPath('StartMenu')) -Recurse -Include '*.lnk') + `
(Get-ChildItem -Path ([Environment]::GetFolderPath('CommonStartMenu')) -Recurse -Include '*.lnk')

Environment data

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      5.1.18356.1
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.18356.1
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
> (Get-Module -ListAvailable PSScriptAnalyzer).Version | ForEach-Object { $_.ToString() }
1.18.0

Start by running the supplied PowerShell script through Invoke-Formatter with PSScriptAnalyzer 1.18.0 and inspect how multiple backtick continuations are indented. Done means the third line is indented to the same level as the second and the formatted output matches the input.