Fix newlines

Author: chsienki

src/Compiler/Microsoft.CodeAnalysis.Razor.Compiler/src/Mvc/PagesPropertyInjectionPass.cs

@@ -65,9 +65,7 @@ static string nullableEnable(bool nullableEnabled, string code)
             }
 
             return $"""
-                #nullable restore
-                {code}!;
-                #nullable disable
+                #nullable restore\r\n{code}!;\r\n#nullable disable
                 """;
         }
     }