refactor: merge to demo new usage

samples/androidApp/src/androidMain/kotlin/com/highcapable/flexiui/demo/MainActivity.kt

@@ -21,7 +21,6 @@
  */
 package com.highcapable.flexiui.demo
 
-import MainView
 import android.os.Bundle
 import androidx.activity.compose.setContent
 import com.highcapable.betterandroid.ui.component.activity.AppComponentActivity
@@ -30,6 +29,6 @@ class MainActivity : AppComponentActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        setContent { MainView() }
+        setContent { App() }
     }
 }