_boot_to_anaconda: use welcome launcher for KDE too

This means we don't need the double-click logic, and it seems to
be more reliable on F43+.

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

needles/kde/live_anaconda_icon-kde-welcome-20250906.json

@@ -1,11 +1,11 @@
 {
   "area": [
     {
-      "height": 48,
+      "width": 136,
+      "height": 133,
+      "xpos": 446,
       "type": "match",
-      "xpos": 34,
+      "ypos": 348
-      "ypos": 16,
-      "width": 47
     }
   ],
   "properties": [],

needles/kde/live_anaconda_icon-newlogo-20210429.json

@@ -1,16 +0,0 @@
-{
-  "area": [
-    {
-      "width": 41,
-      "xpos": 36,
-      "height": 40,
-      "type": "match",
-      "ypos": 19
-    }
-  ],
-  "properties": [],
-  "tags": [
-    "live_start_anaconda_icon",
-    "DESKTOP-kde"
-  ]
-}

tests/_boot_to_anaconda.pm

@@ -191,10 +191,7 @@ sub run {
                 }
                 # if we hit the g-i-s flow we already launched
                 unless ($launched) {
-                    # for KDE we need to double-click
+                    assert_and_click("live_start_anaconda_icon");
-                    my $dclick = 0;
-                    $dclick = 1 if (get_var("DESKTOP") eq "kde");
-                    assert_and_click("live_start_anaconda_icon", dclick => $dclick);
                 }
             }
             # wait for anaconda to appear