[mapplauncherd] Avoid using PROG_NAME_LAUNCHER in installed headers

src/launcherlib/logger.cpp

@@ -31,6 +31,9 @@ bool Logger::m_debugMode = false;
 
 void Logger::openLog(const char * progName)
 {
+    if (!progName)
+        progName = PROG_NAME_LAUNCHER;
+
     if (Logger::m_isOpened)
     {
         Logger::closeLog();

src/launcherlib/logger.h

@@ -36,7 +36,7 @@ public:
      * \brief Open the log
      * \param progName Program name as it will be seen in the log.
      */
-    static void openLog(const char * progName = PROG_NAME_LAUNCHER);
+    static void openLog(const char * progName = 0);
 
     /*!
      * \brief Close the log