Move reading mode toast to default bottom position

Toasts don't block user interaction, so it's probably fine.

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

@@ -10,7 +10,6 @@ import android.graphics.Bitmap
 import android.graphics.Color
 import android.os.Build
 import android.os.Bundle
-import android.view.Gravity
 import android.view.KeyEvent
 import android.view.Menu
 import android.view.MenuItem
@@ -562,9 +561,7 @@ class ReaderActivity : BaseRxActivity<ReaderActivityBinding, ReaderPresenter>()
         try {
             val strings = resources.getStringArray(R.array.viewers_selector)
             readingModeToast?.cancel()
-            readingModeToast = toast(strings[mode]) {
-                it.setGravity(Gravity.CENTER_VERTICAL or Gravity.CENTER_HORIZONTAL, 0, 0)
-            }
+            readingModeToast = toast(strings[mode])
         } catch (e: ArrayIndexOutOfBoundsException) {
             Timber.e("Unknown reading mode: $mode")
         }