Update GlobalVariable.mqh

When entering we delete any existing global variable with that name first. Otherwise this will cause a loop as GlobalVariable::makeTemp(m_name) will return false all the time.

Include/Mql/Lang/GlobalVariable.mqh

@@ -248,6 +248,7 @@ public:
 
    void              enter()
      {
+      GlobalVariable::remove(m_name);
       while(!GlobalVariable::makeTemp(m_name) && !IsStopped())
          Sleep(100);
      }