All attribute values now will print their name as result of toString

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/AttributeValue.kt

@@ -1,3 +1,5 @@
 package dev.inmo.jsuikit.modifiers
 
-sealed class AttributeValue(val name: String)
+sealed class AttributeValue(val name: String) {
+    override fun toString(): String = name
+}

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitDropdown.kt

@@ -43,8 +43,6 @@ sealed class UIKitDropdown(classname: String) : UIKitModifier {
 
         }
 
-        override fun toString(): String = name
-
     }
 
     sealed class Mode(name: String) : AttributeValue(name) {