Add yet another KDE login screen variant needle

Seems like the generic user avatars got a bit bigger in Rawhide?
Whatever.

needles/kde/login_sddm-20170405.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "xpos": 464,
+      "type": "match",
+      "width": 94,
+      "ypos": 256,
+      "height": 92
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-kde",
+    "graphical_login",
+    "login_screen"
+  ]
+}