Remove obsolete comment about isVisiblePatternEnabled()

The comment in LockPatternUtils#isVisiblePatternEnabled() was only
needed because there were two sources of truth for the default value.
Now that there is only one source of truth, it is not needed.

Bug: 270013005
Change-Id: Ia531f84bcedc957393f93222679efae848a82822

core/java/com/android/internal/widget/LockPatternUtils.java

@@ -1040,9 +1040,6 @@ public class LockPatternUtils {
      */
     @UnsupportedAppUsage
     public boolean isVisiblePatternEnabled(int userId) {
-        // Default to true, since this gets explicitly set to true when a pattern is first set
-        // anyway, which makes true the user-visible default.  The low-level default should be the
-        // same, in order for FRP credential verification to get the same default.
         return getBoolean(Settings.Secure.LOCK_PATTERN_VISIBLE, true, userId);
     }