Add a variant GDM needle for Arabic

Seems on x86_64 the text cursor is at the left of the text entry
box, but on aarch64 it's at the right. I have no idea why.

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

needles/gnome/arabic/login_gdm_input_arabic-right_cursor-20180625.json

@@ -0,0 +1,17 @@
+{
+  "area": [
+    {
+      "xpos": 340,
+      "ypos": 375,
+      "width": 345,
+      "type": "match",
+      "height": 61
+    }
+  ],
+  "properties": [],
+  "tags": [
+    "DESKTOP-gnome",
+    "LANGUAGE-arabic",
+    "graphical_login_input"
+  ]
+}