Revert "Adds blinding + blindfolds (#8688)" (#9689)

This reverts commit 7a7ab5e8c1.

Resources/Textures/Clothing/Eyes/Misc/blindfold.rsi/meta.json

@@ -1,18 +0,0 @@
-{
-  "version": 1,
-  "license": "CC-BY-SA-3.0",
-  "copyright": "Taken from tgstation at https://github.com/tgstation/tgstation/commit/40d89d11ea4a5cb81d61dc1018b46f4e7d32c62a",
-  "size": {
-    "x": 32,
-    "y": 32
-  },
-  "states": [
-    {
-      "name": "icon"
-    },
-    {
-      "name": "equipped-EYES",
-      "directions": 4
-    }
-  ]
-}

Resources/Textures/Shaders/greyscale_fullscreen.swsl

@@ -1,9 +0,0 @@
-uniform sampler2D SCREEN_TEXTURE;
-
-void fragment() {
-    highp vec4 color = zTextureSpec(SCREEN_TEXTURE, UV);
-
-    highp float grey = dot(color.rgb, vec3(0.299, 0.587, 0.114));
-
-    COLOR = vec4(vec3(grey), color.a);
-}