fix: Open Avalonia Xaml Designer on double-clicking on Errors list

[workgroupengineering]

Current behavior:

When double-clicking the error list entry, XML Designer opens instead of Avalonia Xaml Designer

Expected behavior

When double-clicking the error list entry, XML Designer opens

How simulate issue:

1. Create new Avalonia Project
2. Add Resource Dictionary named `icons.axaml'
3. Edit App.axaml like this

<Application xmlns="https://github.com/avaloniaui"
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
           xmlns:local="using:ACTest"
           x:Class="ACTest.App">
  <Application.DataTemplates>
      <local:ViewLocator/>
  </Application.DataTemplates>

  <Application.Resources>
 	 <ResourceDictionary>
 		 <ResourceDictionary.MergedDictionaries>
 			 <ResourceInclude Source="Icons.axaml" />
 		 </ResourceDictionary.MergedDictionaries>
 	 </ResourceDictionary>
 </Application.Resources>
 
  <Application.Styles>
      <FluentTheme/>
  </Application.Styles>
</Application>

4. You can see in Errors list error like this:

   Severity	Code	Description	Project	File	Line	Suppression State
   Error	Unable to resolve XAML resource "avares://ACTest/Designer/Icons.axaml" in the "ACTest" assembly. Line 12, position 22.	ACTest	.\ACTest\ACTest\App.axaml	12

5. do double-clicking

6. XML Designer will open

[maxkatz6]

Expected behavior
When double-clicking the error list entry, XML Designer opens

I think you meant "XAML designer", right?