Bug 1932731 - Part 2 Replace onVisit with onVisits in suite. rs=me

Port Bug 1421703 "replace onVisit with onVisits".

suite/modules/WindowsPreviewPerTab.jsm

@@ -835,7 +835,7 @@ var AeroPeek = {
   // nsINavHistoryObserver implementation
   onBeginUpdateBatch() {},
   onEndUpdateBatch() {},
-  onVisit() {},
+  onVisits() {},
   onTitleChanged() {},
   onFrecencyChanged() {},
   onManyFrecenciesChanged() {},