fix disabled slots display

src/graphics/ui/elements/InventoryView.cpp

@@ -135,7 +135,7 @@ void SlotView::draw(const DrawContext* pctx, Assets* assets) {
     const int slotSize = InventoryView::SLOT_SIZE;
 
     const ItemStack& stack = *bound;
-    glm::vec4 tint(1.0f);
+    glm::vec4 tint(1, 1, 1, isEnabled() ? 1 : 0.5f);
     glm::vec2 pos = calcPos();
     glm::vec4 color = getColor();