More bottom sheet improvements (#5183)

* Edge-to-edge bottom sheet when possible

* ReaderSettingsSheet: Animate background dim changes

* Adjust modal bottom sheet in-out animation

* Use public method to get bottom sheet behavior

* Set bottom sheet peek size to 50% screen height

The current auto peek height gives too low value on landscape orientation

* Set bottom sheet navigation bar scrim when needed

app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/SourceFilterSheet.kt

@@ -33,7 +33,7 @@ class SourceFilterSheet(
 
     override fun show() {
         super.show()
-        sheetBehavior.state = BottomSheetBehavior.STATE_EXPANDED
+        behavior.state = BottomSheetBehavior.STATE_EXPANDED
     }
 
     fun setFilters(items: List<IFlexible<*>>) {