Revert "Add workaround for log filtering issue in cockpit 251"

This reverts commit 8992d37ce6.
The workaround is no longer needed as cockpit 252, which fixes
the bug, is stable for all current releases.

needles/cockpit/cockpit_logs_apply-20210819.json

@@ -1,15 +0,0 @@
-{
-  "area": [
-    {
-      "xpos": 854,
-      "ypos": 251,
-      "width": 20,
-      "height": 23,
-      "type": "match"
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "cockpit_logs_apply"
-  ]
-}

tests/server_cockpit_basic.pm

@@ -21,15 +21,6 @@ sub run {
     type_string "info\n";
     wait_still_screen 5;
     # now click an entry
-    unless (check_screen "cockpit_logs_entry") {
-        # in cockpit 251, just hitting enter doesn't apply the change,
-        # we have to click a button. FIXME: in future this will be
-        # fixed and we will be able to remove this workaround:
-        # https://github.com/cockpit-project/cockpit/issues/16243
-        assert_and_click "cockpit_logs_apply";
-        record_soft_failure "needed to click to apply filter change - https://github.com/cockpit-project/cockpit/issues/16243";
-        wait_still_screen 5;
-    }
     assert_and_click "cockpit_logs_entry";
     # check we get to the appropriate detail screen
     assert_screen "cockpit_logs_detail";