Replace custom visibility extension functions

app/src/main/java/eu/kanade/tachiyomi/widget/RevealAnimationView.kt

@@ -6,8 +6,8 @@ import android.content.Context
 import android.util.AttributeSet
 import android.view.View
 import android.view.ViewAnimationUtils
-import eu.kanade.tachiyomi.util.view.invisible
-import eu.kanade.tachiyomi.util.view.visible
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
 
 class RevealAnimationView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
     View(context, attrs) {
@@ -21,7 +21,7 @@ class RevealAnimationView @JvmOverloads constructor(context: Context, attrs: Att
      */
     fun hideRevealEffect(centerX: Int, centerY: Int, initialRadius: Int) {
         // Make the view visible.
-        this.visible()
+        this.isVisible = true
 
         // Create the animation (the final radius is zero).
         val anim = ViewAnimationUtils.createCircularReveal(
@@ -35,7 +35,7 @@ class RevealAnimationView @JvmOverloads constructor(context: Context, attrs: Att
         anim.addListener(object : AnimatorListenerAdapter() {
             override fun onAnimationEnd(animation: Animator) {
                 super.onAnimationEnd(animation)
-                this@RevealAnimationView.invisible()
+                this@RevealAnimationView.isInvisible = true
             }
         })
 
@@ -52,7 +52,7 @@ class RevealAnimationView @JvmOverloads constructor(context: Context, attrs: Att
      * @return sdk version lower then 21
      */
     fun showRevealEffect(centerX: Int, centerY: Int, listener: Animator.AnimatorListener): Boolean {
-        this.visible()
+        this.isVisible = true
 
         val height = this.height