changing structure and add default.jpg

themes/Tokyo-Night/gtk-3.0/assets/scalable/line-symbolic.svg

@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg
+   width="24"
+   height="24"
+   version="1.1"
+   viewBox="0 0 24 24"
+   id="svg17473"
+   sodipodi:docname="checkbox-mixed-symbolic.svg"
+   inkscape:version="1.2.1 (9c6d41e410, 2022-07-14)"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg">
+  <defs
+     id="defs17477" />
+  <sodipodi:namedview
+     id="namedview17475"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:showpageshadow="2"
+     inkscape:pageopacity="0.0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     showgrid="false"
+     inkscape:zoom="9.8333333"
+     inkscape:cx="2.2881356"
+     inkscape:cy="12.050847"
+     inkscape:window-width="1920"
+     inkscape:window-height="1012"
+     inkscape:window-x="0"
+     inkscape:window-y="32"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg17473" />
+  <path
+     d="m 7,11 h 10 v 2 H 7 Z"
+     id="path17471"
+     sodipodi:nodetypes="ccccc" />
+</svg>