Refactor the Oh My Posh profile

scripts/Windows/Config/Oh My Posh/Install.ps1

@@ -5,8 +5,13 @@ param($context)
 [Context] $context = $context;
 Write-Host "Configuring Oh My Posh!";
 
+$createInvokation = {
+    param($initializer)
+    return "& ([scriptblock]::Create(($initializer) -join `"``n`"))";
+}
+
 $context.AddPowerShellProfileStatement(
     "999_Oh My Posh",
     @(
-        'oh-my-posh init pwsh | Invoke-Expression;',
-        "oh-my-posh completion powershell | Invoke-Expression;") -join [System.Environment]::NewLine);
+        $createInvokation.Invoke("oh-my-posh init pwsh"),
+        $createInvokation.Invoke("oh-my-posh completion powershell")) -join [System.Environment]::NewLine);