Update some Sinon reset() calls

In Sinon 2, reset() now resets both behavior and history, so if a stub
specifies behavior and we want to use it again, we have to call
resetHistory().

test/tests/preferences_syncTest.js

@@ -54,7 +54,7 @@ describe("Sync Preferences", function () {
 
 			beforeEach(function* (){
 				yield win.Zotero_Preferences.Sync.unlinkAccount(false);
-				deleteAPIKey.reset();
+				deleteAPIKey.resetHistory();
 				Zotero.alert.reset();
 			});