Remove this test to verify that things were modified since a certain time.

That assumption doesn't hold up when your environment doesn't have access to a
real clock and thinks it's living in 1970 :)

--- a/tests/test_fileapp.py    2015-04-23 13:48:37.000000000 -0700
+++ b/tests/test_fileapp.py	2016-02-22 19:20:08.332802417 -0800
@@ -223,8 +223,6 @@
                   status=304)
     res = app.get('/', headers={'If-None-Match': 'asdf'},
                   status=200)
-    res = app.get('/', headers={'If-Modified-Since': 'Sat, 1 Jan 2005 12:00:00 GMT'},
-                  status=200)
     res = app.get('/', headers={'If-Modified-Since': last_mod + '; length=100'},
                   status=304)
     res = app.get('/', headers={'If-Modified-Since': 'invalid date'},
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<tr><td><span title='2020-07-15 22:15:50 +0300'>2020-07-15</span></td><td><a href='/guix/commit/gnu/tests/monitoring.scm?id=37fea3c30a79d2c401dd64b446a0fbfe4a14b966'>tests: zabbix: Fix typo in comment.</a><span class='msg-avail'>...</span></td><td>Oleg Pykhalov</td></tr>
<tr><td><span title='2020-03-09 23:46:36 +0100'>2020-03-09</span></td><td><a href='/guix/commit/gnu/tests/monitoring.scm?id=7e5f016cdbca09b6ee2af71e495002e7686ef6f7'>tests: zabbix: Set 'PATH' before running the scripts.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>