texture_cache: Correct format R16U as sibling

src/video_core/texture_cache/surface_params.cpp

@@ -76,6 +76,7 @@ SurfaceParams SurfaceParams::CreateForTexture(Core::System& system,
     params.type = GetFormatType(params.pixel_format);
     if (entry.IsShadow() && params.type == SurfaceType::ColorTexture) {
         switch (params.pixel_format) {
+        case PixelFormat::R16U:
         case PixelFormat::R16F: {
             params.pixel_format = PixelFormat::Z16;
             break;

src/video_core/texture_cache/texture_cache.h

@@ -258,7 +258,7 @@ protected:
         for (u32 i = 0; i < max_formats; i++) {
             siblings_table[static_cast<PixelFormat>(i)] = PixelFormat::Invalid;
         }
-        make_siblings(PixelFormat::Z16, PixelFormat::R16F);
+        make_siblings(PixelFormat::Z16, PixelFormat::R16U);
         make_siblings(PixelFormat::Z32F, PixelFormat::R32F);
         make_siblings(PixelFormat::Z32FS8, PixelFormat::RG32F);
         sampled_textures_stack.resize(64);