Update mpv shaders

config/mpv/shaders/FSRCNNX_x2_8-0-4-1.glsl

@@ -1,4 +1,22 @@
-// Source: https://github.com/xzpyth/mpv-config/blob/main/shaders/FSRCNNX_x2_8-0-4-1.glsl
+// Revised 03/05/21
+// https://github.com/deus0ww/mpv-conf/tree/master/shaders/igv
+//
+// FSRCNNX by igv
+//
+// Copyright (C) 2017-2021 igv
+//
+// This program 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 program 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 program.  If not, see <https://www.gnu.org/licenses/>.
 
 //!HOOK LUMA
 //!WHEN OUTPUT.w LUMA.w / 1.300 > OUTPUT.h LUMA.h / 1.300 > *
@@ -410,4 +428,4 @@ vec2 base = SUBCONV1_pos + (vec2(0.5) - fcoord) * SUBCONV1_pt;
 ivec2 index = ivec2(fcoord * vec2(2));
 vec4 res = SUBCONV1_tex(base);
 return vec4(res[index.x * 2 + index.y], 0, 0, 1);
-}
+}