Ensure accessibility shortcut preference summaries are not focusable

In this case, keyboard focusability causes TalkBack to exclude summary
text from the grouped content surfaced when focusing the top-level list
item.

Bug: 400538324
Test: Manually with TalkBack, including ClickableSpan in summaries
Flag: EXEMPT bug fix
Change-Id: Ib8bc3276aee857121381de7bc4e23e05cd512383

src/com/android/settings/accessibility/shortcuts/ShortcutOptionPreference.java

@@ -108,6 +108,7 @@ public class ShortcutOptionPreference extends CheckBoxPreference {
         if (summaryView != null) {
             mSummaryTextLineHeight = summaryView.getLineHeight();
             summaryView.setMovementMethod(LinkMovementMethod.getInstance());
+            summaryView.setFocusable(false);
         }
 
         syncSummaryView(holder);