Fix that holding volume buttons to activate Extra dim feature doesn't do anything.

Root cause:
Original framework design which has 3 seconds restriction to prevent users from easily triggering the accessibility volume shortcut when first time using it.

Solution:
The system would bypass the 3 seconds restriction if users manually set any feature as the volume key shortcut.

Bug: 202602908
Test: make RunSettingsRoboTests ROBOTEST_FILTER=ToggleFeaturePreferenceFragmentTest
Change-Id: I324321577263904b6ff8b66e411766d16a6430dc

src/com/android/settings/accessibility/AccessibilityUtil.java

@@ -434,4 +434,15 @@ public final class AccessibilityUtil {
     public static boolean isSystemApp(@NonNull AccessibilityServiceInfo info) {
         return info.getResolveInfo().serviceInfo.applicationInfo.isSystemApp();
     }
+
+    /**
+     * Bypasses the timeout restriction if volume key shortcut assigned.
+     *
+     * @param context the current context.
+     */
+    public static void skipVolumeShortcutDialogTimeoutRestriction(Context context) {
+        Settings.Secure.putInt(context.getContentResolver(),
+                Settings.Secure.SKIP_ACCESSIBILITY_SHORTCUT_DIALOG_TIMEOUT_RESTRICTION, /*
+                    true */ 1);
+    }
 }