Update schema and fix build issue

Author: MattEqualsCoder

MSUScripter/Program.cs

@@ -2,6 +2,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Avalonia.Threading;

MSUScripter/Services/ControlServices/MsuSongInfoPanelService.cs

@@ -96,7 +96,7 @@ public void ImportAudioMetadata(string file)
 
         return
             """
-            # yaml-language-server: $schema=https://raw.githubusercontent.com/MattEqualsCoder/MSUScripter/v3.3.0-changes/Schemas/MsuSongInfo.json
+            # yaml-language-server: $schema=https://raw.githubusercontent.com/MattEqualsCoder/MSUScripter/main/Schemas/MsuSongInfo.json
             # Use Visual Studio Code with the YAML plugin from redhat for schema support
             
             """ + yamlText;

MSUScripter/Services/ControlServices/MsuSongMsuPcmInfoPanelService.cs

@@ -126,7 +126,7 @@ public void HideSubTracksSubChannelsWarning()
 
         return
             """
-            # yaml-language-server: $schema=https://raw.githubusercontent.com/MattEqualsCoder/MSUScripter/v3.3.0-changes/Schemas/MsuSongMsuPcmInfo.json
+            # yaml-language-server: $schema=https://raw.githubusercontent.com/MattEqualsCoder/MSUScripter/main/Schemas/MsuSongMsuPcmInfo.json
             # Use Visual Studio Code with the YAML plugin from redhat for schema support
             
             """ + yamlText;