Center reader transition text properly (fixes #3819)

app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/ReaderTransitionView.kt

@@ -19,6 +19,7 @@ class ReaderTransitionView @JvmOverloads constructor(context: Context, attrs: At
 
     init {
         inflate(context, R.layout.reader_transition_view, this)
+        layoutParams = LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT)
     }
 
     fun bind(transition: ChapterTransition) {

app/src/main/res/layout/reader_transition_view.xml

@@ -2,9 +2,9 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
+    android:layout_width="wrap_content"
     android:layout_height="wrap_content"
-    android:gravity="center"
+    android:layout_gravity="center"
     android:orientation="vertical">
 
     <TextView