Further reduction of include dependencies

rtgui/adjuster.cc

@@ -17,14 +17,14 @@
  *  along with RawTherapee.  If not, see <https://www.gnu.org/licenses/>.
  */
 #include "adjuster.h"
+
 #include <sigc++/slot.h>
 #include <cmath>
-#include "multilangmgr.h"
-#include "../rtengine/rt_math.h"
-#include "options.h"
-#include "guiutils.h"
-#include "rtimage.h"
 
+#include "multilangmgr.h"
+#include "options.h"
+#include "rtimage.h"
+#include "../rtengine/rt_math.h"
 
 namespace {