Add KDE package refresh needle, tweak retry logic a bit

KDE update was still often failing on #1943943, so this tries a
bit harder to work around it. We add a 'refresh' needle for KDE,
and tweak the 'retry' logic to click it if we get to that point.
Note adding the needle also changes behaviour slightly - we may
click this needle if we see it on first entering the screen. So
either change may be helping. Either way, this does make the test
more reliable.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

needles/kde/desktop_package_tool_update_refresh-kde-20210330.json

@@ -0,0 +1,16 @@
+{
+  "area": [
+    {
+      "height": 16,
+      "type": "match",
+      "xpos": 748,
+      "ypos": 226,
+      "width": 19
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-kde",
+    "desktop_package_tool_update_refresh"
+  ]
+}

tests/desktop_update_graphical.pm

@@ -102,8 +102,9 @@ sub run {
             assert_screen ['kde_offline_update_reboot', 'desktop_package_tool_update_apply'];
             # break out if we reached the reboot button
             last if (match_has_tag 'kde_offline_update_reboot');
-            # otherwise, click apply again and loop again
-            click_lastmatch;
+            # otherwise, try refresh and apply
+            assert_and_click 'desktop_package_tool_update_refresh';
+            assert_and_click 'desktop_package_tool_update_apply';
         }
         assert_and_click 'kde_offline_update_reboot';
         boot_to_login_screen;