Add shortcut to edit categories screen from category setting dialog (closes #6280)

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

@@ -56,21 +56,24 @@ class ChangeMangaCategoriesDialog<T>(bundle: Bundle? = null) :
                             .filterNotNull()
                         (targetController as? Listener)?.updateCategoriesForMangas(mangas, add, remove)
                     }
+                    setNeutralButton(R.string.action_edit) { _, _ -> openCategoryController() }
                 } else {
                     setMessage(R.string.information_empty_category_dialog)
-                    setPositiveButton(R.string.action_edit_categories) { _, _ ->
-                        if (targetController is LibraryController) {
-                            val libController = targetController as LibraryController
-                            libController.clearSelection()
-                        }
-                        router.popCurrentController()
-                        router.pushController(CategoryController().withFadeTransaction())
-                    }
+                    setPositiveButton(R.string.action_edit_categories) { _, _ -> openCategoryController() }
                 }
             }
             .create()
     }
 
+    private fun openCategoryController() {
+        if (targetController is LibraryController) {
+            val libController = targetController as LibraryController
+            libController.clearSelection()
+        }
+        router.popCurrentController()
+        router.pushController(CategoryController().withFadeTransaction())
+    }
+
     interface Listener {
         fun updateCategoriesForMangas(mangas: List<Manga>, addCategories: List<Category>, removeCategories: List<Category> = emptyList<Category>())
     }