Update mpv shaders

config/mpv/shaders/SSimDownscaler.glsl

@@ -1,19 +1,18 @@
-// Source: https://gist.github.com/igv/36508af3ffc84410fe39761d6969be10
-
-// Requires linear-downscaling=no. Can be used with sharp scalers now (finally able to suppress ringing artifacts).
-
+// Revised 05/15/22
+// https://gist.github.com/igv/36508af3ffc84410fe39761d6969be10
+//
 // SSimDownscaler by Shiandow
 //
 // This library is free software; you can redistribute it and/or
 // modify it under the terms of the GNU Lesser General Public
 // License as published by the Free Software Foundation; either
 // version 3.0 of the License, or (at your option) any later version.
-//
+// 
 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 // Lesser General Public License for more details.
-//
+// 
 // You should have received a copy of the GNU Lesser General Public
 // License along with this library.
 
@@ -217,4 +216,4 @@ vec4 hook() {
     avg /= W;
     vec4 L = POSTKERNEL_texOff(0);
     return vec4(avg[1] + avg[2] * L.rgb - avg[0], L.a);
-}
+}