Remove unused accessor

src/Session.cpp

@@ -216,10 +216,7 @@ void Session::setDarkBackground(bool darkBackground)
 {
     _hasDarkBackground = darkBackground;
 }
-bool Session::hasDarkBackground() const
-{
-    return _hasDarkBackground;
-}
+
 bool Session::isRunning() const
 {
     return _shellProcess && (_shellProcess->state() == QProcess::Running);

src/Session.h

@@ -317,11 +317,6 @@ public:
      * This has no effect once the session is running.
      */
     void setDarkBackground(bool darkBackground);
-    /**
-     * Returns true if the session has a dark background.
-     * See setDarkBackground()
-     */
-    bool hasDarkBackground() const;
 
     /**
      * Attempts to get the shell program to redraw the current display area.