Fix crashes on settings

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAboutFragment.kt

@@ -108,7 +108,7 @@ class SettingsAboutFragment : SettingsNestedFragment() {
                                     UpdateDownloader(activity.applicationContext).execute(downloadLink)
                                 }.show()
                     } else {
-                        context.toast(R.string.update_check_no_new_updates)
+                        activity.toast(R.string.update_check_no_new_updates)
                     }
                 }, {
                     it.printStackTrace()

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsAdvancedFragment.kt

@@ -74,10 +74,10 @@ class SettingsAdvancedFragment : SettingsNestedFragment() {
                     dialog.incrementProgress(1)
                 }, {
                     dialog.dismiss()
-                    context.toast(R.string.cache_delete_error)
+                    activity.toast(R.string.cache_delete_error)
                 }, {
                     dialog.dismiss()
-                    context.toast(getString(R.string.cache_deleted, deletedFiles.get()))
+                    activity.toast(getString(R.string.cache_deleted, deletedFiles.get()))
                     preference.summary = getString(R.string.used_cache, chapterCache.readableSize)
                 })
     }