Make OMP configuration platform independent

scripts/Common/Software/Oh My Posh/Manage.ps1

@@ -34,7 +34,16 @@ Start-SoftwareInstaller @PSBoundParameters `
                 $root = "$($IsWindows ? $env:AppData : "~/.config")/oh-my-posh";
                 $path = Join-Path $root "$($theme.name).omp.json";
                 $null = New-Item -Force -ItemType Directory $root;
-                Set-Content $path (wsl cat $theme.source);
+
+                Set-Content $path (
+                    & {
+                        if ($IsWindows) {
+                            wsl cat $theme.source
+                        } else {
+                            cat $theme.source
+                        }
+                    });
+
                 $theme = [string] $path;
             }