solidify_wallpaper: handle KDE no longer having a handy 'black'

Plasma 6's color chooser seems to have dropped the nice "basic
colors", so choosing black got harder. Let's try using the HTML
color input box thingy instead, and typing #000000, the HTML
color code for black.

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

lib/utils.pm

@@ -1507,7 +1507,9 @@ sub solidify_wallpaper {
         assert_and_click "deskset_select_color";
         wait_still_screen 2;
         # Select black
-        assert_and_click "deskset_select_black";
+        assert_and_dclick "deskset_html_color";
+        wait_still_screen 2;
+        type_safely "000000";
         wait_still_screen 2;
         # Confirm
         assert_and_click "kde_ok";

needles/kde/apps/deskset_html_color-20231129.json

@@ -0,0 +1,15 @@
+{
+  "area": [
+    {
+      "xpos": 583,
+      "ypos": 539,
+      "width": 88,
+      "height": 25,
+      "type": "match"
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "deskset_html_color"
+  ]
+}

needles/kde/apps/deskset_select_black.json

@@ -1,15 +0,0 @@
-{
-  "properties": [],
-  "tags": [
-    "deskset_select_black"
-  ],
-  "area": [
-    {
-      "xpos": 242,
-      "ypos": 144,
-      "width": 14,
-      "height": 11,
-      "type": "match"
-    }
-  ]
-}