Search: include all category children in case category matches itself

Preference categories are Preference instances with disabled state thus
they were not covered by 406d91a
This fixis it.

Author: C3C0

src/com/ceco/oreo/gravitybox/GravityBoxSettings.java

@@ -2009,7 +2009,8 @@ private int filterPreferencesInternal(PreferenceGroup prefGroup, PreferenceGroup
                     p.getTitle().toString()).toLowerCase(Locale.getDefault());
                 String summary = (p.getSummary() == null ? "" :
                     p.getSummary().toString()).toLowerCase(Locale.getDefault());
-                if (p.isEnabled() && (title.contains(mSearchQuery) || summary.contains(mSearchQuery))) {
+                if ((p.isEnabled() || (p instanceof PreferenceCategory)) && 
+                        (title.contains(mSearchQuery) || summary.contains(mSearchQuery))) {
                     matchCount++;
                 } else if (p instanceof PreferenceGroup && p.getIntent() == null) {
                     matchCount += filterPreferencesInternal((PreferenceGroup)p, prefGroup);