Revert "Load Tegaki from rawgit.com if loading from s.4cdn.org fails or is blocked."

This reverts commits 6027d94364fb1f70f9229aafb11d9696d34450e7 and d20e918c22cd1f361b91b67c5f340d6557fcf04e.

src/Posting/QR.oekaki.coffee

@@ -60,34 +60,19 @@ QR.oekaki =
         document.querySelector('#qr .oekaki').hidden = false
 
   load: (cb) ->
-    n = 0
-    onload = ->
-      cb() if ++n is 2
-    onerror = ->
-      $.rm @
-      script = $.el 'script',
-        src: 'https://rawgit.com/desuwa/tegaki/master/tegaki.js'
-      $.on script, 'load', onload
-      $.add d.head, script
-    script = $ 'script[src^="//s.4cdn.org/js/painter"], script[src="https://rawgit.com/desuwa/tegaki/master/tegaki.js"]', d.head
-    if script
-      if !script.dataset.success
-        $.global ->
-          document.querySelector('script[src^="//s.4cdn.org/js/painter"], script[src="https://rawgit.com/desuwa/tegaki/master/tegaki.js"]').dataset.success = !!window.Tegaki
-      if script.dataset.success is 'true'
-        cb()
-      else
-        n = 1
-        onerror.call script
+    if $ 'script[src^="//s.4cdn.org/js/painter"]', d.head
+      cb()
     else
       style = $.el 'link',
         rel: 'stylesheet'
         href: "//s.4cdn.org/css/painter.#{Date.now()}.css"
       script = $.el 'script',
         src: "//s.4cdn.org/js/painter.min.#{Date.now()}.js"
+      n = 0
+      onload = ->
+        cb() if ++n is 2
       $.on style,  'load', onload
       $.on script, 'load', onload
-      $.on script, 'error', onerror
       $.add d.head, [style, script]
 
   draw: ->

src/config/Config.coffee

@@ -862,7 +862,6 @@ Config =
     http://cdn.mathjax.org
     https://cdn.mathjax.org
     https://cdnjs.cloudflare.com
-    https://rawgit.com
     'self'
     'unsafe-inline'
     'unsafe-eval'