Update CSharpHtml.cs

Support linuxOS or macOS

Author: cdpidan

WebApiClientCore.OpenApi.SourceGenerator/CSharpHtml.cs

@@ -39,7 +39,7 @@ public static CSharpHtml<T> Views<T>(string name)
  throw new ArgumentNullException(nameof(name));
  }
 
- var path = $"Views\\{name}";
+ var path = Path.Combine("Views", name);
  return new CSharpHtml<T>(path);
  }
  }
@@ -198,4 +198,4 @@ public static IRazorEngineCompiledTemplate Compile(string content)
  }
  }
  }
-}
+}