Refactor manipulation of nextcloud sync file

scripts/Windows/Scripts/Context.ps1

@@ -244,13 +244,24 @@ class Context {
             $configName += "WithPlaceholders";
         }
 
-        Add-Content $($this.GetNextcloudConfigFile()) `
-            -Value (
+        $accountSectionEntered = $false;
+
+        Get-Content $($this.GetNextcloudConfigFile()) | `
+            ForEach-Object {
+                if ($_ -eq "[Accounts]") {
+                    $accountSectionEntered = $true;
+                }
+
+                if ($_ -eq "" -and $accountSectionEntered) {
                 [string]::Join(
                     "`n",
                     @(
                         "0\$configName\$folderID\localPath=$localPath",
-                        "0\$configName\$folderID\targetPath=$targetPath")));
+                            "0\$configName\$folderID\targetPath=$targetPath"));
+                }
+
+                $_;
+            } | Set-Content $this.GetNextcloudConfigFile();
 
         Start-Process $nextcloudPath;
     }