Fix met location highlight on startup

Finally found the right place to put this

PKHeX.WinForms/Controls/PKM Editor/PKMEditor.cs

@@ -1324,6 +1324,9 @@ static int GetWidth(IReadOnlyCollection<ComboItem> items, Font f)
         {
             ValidateChildren(); // hacky validation forcing
         }
+
+        CB_MetLocation.SelectionLength = 0;
+        CB_EggLocation.SelectionLength = 0;
     }
 
     private void UpdateExtraByteValue(object sender, EventArgs e)