lrc: remove const from NewAccountModel get method

- remove the complexity of const_cast in windows platform

Change-Id: I036042cb74f3332075cf8cd56f2c694ecd0fe799

src/api/lrc.h

@@ -47,7 +47,7 @@ public:
      * get a reference on account model.
      * @return a NewAccountModel&.
      */
-    const NewAccountModel& getAccountModel() const;
+    NewAccountModel& getAccountModel() const;
     /**
      * get a reference on the behavior controller.
      * @return a BehaviorController&.

src/lrc.cpp

@@ -74,7 +74,7 @@ Lrc::~Lrc()
 #endif //ENABLE_LIBWRAP
 }
 
-const NewAccountModel&
+NewAccountModel&
 Lrc::getAccountModel() const
 {
     return *lrcPimpl_->accountModel;
@@ -147,4 +147,4 @@ LrcPimpl::LrcPimpl(Lrc& linked)
 {
 }
 
-} // namespace lrc
+} // namespace lrc
\ No newline at end of file