tests: Set auto-save-interval to 0

Otherwise history tests could fail because waiting for
"Saved to *history" waited for a previous line, not the newest one.

It also doesn't make any sense to save stuff anyways.

tests/end2end/fixtures/quteprocess.py

@@ -305,6 +305,7 @@ class QuteProc(testprocess.Process):
         settings = [
             ('ui', 'message-timeout', '0'),
             ('network', 'ssl-strict', 'false'),
+            ('general', 'auto-save-interval', '0'),
         ]
         for sect, opt, value in settings:
             self.set_setting(sect, opt, value)