imp - Whitelisted PREF for preferred elements

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We've whitelisted the PREF type as it's actually a real type.

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Type: imp
Breaking: False
Doc Required: False
Part: 1/1

VisualCard/Parsers/VcardParser.cs

@@ -68,7 +68,7 @@ public Card Parse()
             // Iterate through all the lines
             bool constructing = false;
             StringBuilder valueBuilder = new();
-            string[] allowedTypes = ["HOME", "WORK"];
+            string[] allowedTypes = ["HOME", "WORK", "PREF"];
             for (int i = 0; i < CardContent.Length; i++)
             {
                 // Get line