Minor cleanup

Fixing some things that were errors when compiling against SDK 33.

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt

@@ -386,7 +386,7 @@ class LibraryController(
     override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
         createOptionsMenu(menu, inflater, R.menu.library, R.id.action_search)
         // Mutate the filter icon because it needs to be tinted and the resource is shared.
-        menu.findItem(R.id.action_filter).icon.mutate()
+        menu.findItem(R.id.action_filter).icon?.mutate()
     }
 
     fun search(query: String) {
@@ -412,7 +412,7 @@ class LibraryController(
         // Tint icon if there's a filter active
         if (settingsSheet.filters.hasActiveFilters()) {
             val filterColor = activity!!.getResourceColor(R.attr.colorFilterActive)
-            filterItem.icon.setTint(filterColor)
+            filterItem.icon?.setTint(filterColor)
         }
     }