MT#59962 DSMCoreModule: make `resolveVars()` be using reference

Instead of copying string parameter, just pass via reference.

Fixes:

    Variable copied when it could be moved (COPY_INSTEAD_OF_MOVE)

Change-Id: I872cd9631bbadc746aea12e7ae5840670fa16e8f

apps/dsm/DSMModule.cpp

@@ -55,10 +55,10 @@ bool isNumber(const std::string& s) {
   return true;
 }
 
-string resolveVars(const string ts, AmSession* sess,
+string resolveVars(const string& _s, AmSession* sess,
 		   DSMSession* sc_sess, map<string,string>* event_params,
 		   bool eval_ops) {
-  string s = ts;
+  string s = _s;
   if (s.length()) {
 
     if(eval_ops) {

apps/dsm/DSMModule.h

@@ -338,7 +338,7 @@ class SCStrArgAction
 #define EXEC_ACTION_STOP			\
   return false;
 
-string resolveVars(const string s, AmSession* sess,
+string resolveVars(const string &s, AmSession* sess,
 		   DSMSession* sc_sess, map<string,string>* event_params,
 		   bool eval_ops = false);