Fix range of spin box

source/RobotAPI/libraries/armem_objects/server/instance/Visu.cpp

@@ -431,6 +431,7 @@ namespace armarx::armem::server::obj::instance
         using namespace armarx::RemoteGui::Client;
 
         showPositionArrow.setValue(visu.showLinPredArrow);
+
         timeOffsetSeconds.setValue(visu.linearPredictionTimeOffsetSeconds);
         timeOffsetSeconds.setRange(-1e6, 1e6);
         timeOffsetSeconds.setSteps(2 * 2 * 1000 * 1000);
@@ -439,6 +440,8 @@ namespace armarx::armem::server::obj::instance
         timeWindowSeconds.setRange(0, 1e6);
         timeWindowSeconds.setSteps(2 * 1000 * 1000);
 
+        ghostAlpha.setRange(0, 1);
+        ghostAlpha.setValue(0.5);
 
         GridLayout grid;
         int row = 0;