Improve handling of custom LS-specific settings

src/solidlsp/language_servers/csharp_language_server.py

@@ -248,8 +248,7 @@ class CSharpLanguageServer(SolidLanguageServer):
         Returns a tuple of (dotnet_path, language_server_dll_path).
         """
         language_enum = cls.get_language_enum_instance()
-        ls_specific_settings = solidlsp_settings.ls_specific_settings or {}
-        language_specific_config = ls_specific_settings.get(language_enum, {})
+        language_specific_config = solidlsp_settings.get_ls_specific_settings(cls.get_language_enum_instance())
         runtime_dependency_overrides = cast(list[dict[str, Any]], language_specific_config.get("runtime_dependencies", []))
 
         logger.log("Resolving runtime dependencies", logging.DEBUG)
@@ -448,7 +447,8 @@ class CSharpLanguageServer(SolidLanguageServer):
         logger.log("Downloading .NET 9 runtime...", logging.INFO)
         dotnet_dir.mkdir(parents=True, exist_ok=True)
 
-        custom_dotnet_runtime_url = solidlsp_settings.ls_specific_settings.get(cls.get_language_enum_instance(), {}).get(
+        custom_settings = solidlsp_settings.get_ls_specific_settings(cls.get_language_enum_instance())
+        custom_dotnet_runtime_url = custom_settings.get(
             "dotnet_runtime_url"
         )
         if custom_dotnet_runtime_url is not None: