pagegenerators: use quiet mode for preloading by default

Change-Id: I0f7702d2f4b32e5950c48eba53a15dee8496c948

Author: xqt

pywikibot/pagegenerators/_factory.py

@@ -306,7 +306,7 @@ def getCombinedGenerator(self,  # noqa: N802
                 preloadgen = pywikibot.pagegenerators.DequePreloadingGenerator
             else:
                 preloadgen = pywikibot.pagegenerators.PreloadingGenerator
-            dupfiltergen = preloadgen(dupfiltergen)
+            dupfiltergen = preloadgen(dupfiltergen, quiet=True)
 
         if self.articlefilter_list:
             dupfiltergen = RegexBodyFilterPageGenerator(