Do a real string unescape for the Include annotation

git-svn-id: https://openmodelica.org/svn/OpenModelica/trunk@20067 f25d12d1-65f4-0310-ae8a-bbce733d8d8e

Author: sjoelund

Compiler/BackEnd/SimCodeUtil.mo

@@ -9415,7 +9415,7 @@ algorithm
       equation
         SCode.MOD(binding = SOME((Absyn.STRING(inc), _))) =
           Mod.getUnelabedSubMod(inMod, "Include");
-        inc_1 = System.stringReplace(inc, "\\\"", "\"");
+        inc_1 = System.unescapedString(inc);
       then
         {inc_1};
     else {};