switch some existing code to use SearchTerm(negated=...)

qt/aqt/customstudy.py

@@ -197,7 +197,7 @@ class CustomStudy(QDialog):
                 dyn["resched"] = True
             elif type == TYPE_REVIEW:
                 terms = self.mw.col.build_search_string(
-                    SearchTerm(card_state=SearchTerm.CARD_STATE_NEW), negate=True
+                    SearchTerm(negated=SearchTerm(card_state=SearchTerm.CARD_STATE_NEW))
                 )
                 ord = DYN_RANDOM
                 dyn["resched"] = True

qt/aqt/sidebar.py

@@ -812,9 +812,7 @@ class SidebarTreeView(QTreeView):
             collapse_key=Config.Bool.COLLAPSE_TAGS,
             type=SidebarItemType.TAG_ROOT,
         )
-        root.on_click = self._filter_func(
-            self.col.build_search_string(SearchTerm(tag="none"), negate=True)
-        )
+        root.on_click = self._filter_func(SearchTerm(negated=SearchTerm(tag="none")))
         root.add_simple(
             name=tr(TR.BROWSING_SIDEBAR_UNTAGGED),
             icon=icon,