adapt unit test to removed SessionGraphicsItem

Tests/Unit/GUI/TestParticleItem.cpp

@@ -17,8 +17,8 @@ TEST_F(TestParticleItem, InitialState)
 
     EXPECT_EQ(item->displayName(), "Particle");
     EXPECT_EQ(item->displayName(), item->itemName());
-    // xpos, ypos, P_FORM_FACTOR, P_MATERIAL, P_ABUNDANCE, P_POSITION
-    EXPECT_EQ(item->children().size(), 6);
+    // P_FORM_FACTOR, P_MATERIAL, P_ABUNDANCE, P_POSITION
+    EXPECT_EQ(item->children().size(), 4);
     EXPECT_TRUE(ItemWithParticles::isTransformationTagName(item->defaultTag()));
 
     GroupItem* group = item->formFactorItem();