fix(magnification suw): followTyping preference should be hidden in magnification suw page

In ag/26349366 we wrapped the follow typing prefernce creation into new
method, but in the new method we didn't assign the created preference to
mFollowingTypingSwitchPreference. So
ToggleScreenMagnificationPreferenceFragmentForSetupWizard can not access
the preference object to hide it. Therefore, as a short-term solution we
assign the created preference to mFollowingTypingSwitchPreference. For a
long-term plan we should not create a preference and hide it in suw,
instead we don't need to create that preference. (tracked in b/335788167)

Bug: 335788769
Flag: NONE
Test: manually
Change-Id: Ideef93127343b7d1105a63006d343cd5ef66de08
diff --git a/src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java b/src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java
index d162272..f9a30c6 100644
--- a/src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java
+++ b/src/com/android/settings/accessibility/ToggleScreenMagnificationPreferenceFragment.java
@@ -91,7 +91,6 @@
     private CheckBox mTripleTapTypeCheckBox;
     @Nullable private CheckBox mTwoFingerTripleTapTypeCheckBox;
     private DialogCreatable mDialogDelegate;
-    private MagnificationFollowTypingPreferenceController mFollowTypingPreferenceController;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -241,14 +240,14 @@
     }
 
     private void addFollowTypingSetting(PreferenceCategory generalCategory) {
-        var followTypingSwitchPreference = new SwitchPreferenceCompat(getPrefContext());
-        followTypingSwitchPreference.setTitle(
+        mFollowingTypingSwitchPreference = new SwitchPreferenceCompat(getPrefContext());
+        mFollowingTypingSwitchPreference.setTitle(
                 R.string.accessibility_screen_magnification_follow_typing_title);
-        followTypingSwitchPreference.setSummary(
+        mFollowingTypingSwitchPreference.setSummary(
                 R.string.accessibility_screen_magnification_follow_typing_summary);
-        followTypingSwitchPreference.setKey(
+        mFollowingTypingSwitchPreference.setKey(
                 MagnificationFollowTypingPreferenceController.PREF_KEY);
-        generalCategory.addPreference(followTypingSwitchPreference);
+        generalCategory.addPreference(mFollowingTypingSwitchPreference);
 
         var followTypingPreferenceController = new MagnificationFollowTypingPreferenceController(
                 getContext(), MagnificationFollowTypingPreferenceController.PREF_KEY);