inventory cell only call touchDown when mouse is up

src/net/torvald/terrarum/modulebasegame/gameitems/ItemFileRef.kt

@@ -60,7 +60,7 @@ open class ItemFileRef(originalID: ItemID) : GameItem(originalID) {
     override var baseMass = 1.0
     override var baseToolSize: Double? = null
     override var inventoryCategory = Category.GENERIC
-    override val isDynamic = true
+    override val isDynamic = false
     override val materialId = ""
     override var equipPosition = EquipPosition.HAND_GRIP
 }