Update deepdream.ipynb (tensorflow#7771)

Gives an error saying it can take only one argument so removed 'utf-8', which solves the problem

Author: gautam1858

tensorflow/examples/tutorials/deepdream/deepdream.ipynb

@@ -278,7 +278,7 @@
     "            tensor = n.attr['value'].tensor\n",
     "            size = len(tensor.tensor_content)\n",
     "            if size > max_const_size:\n",
-    "                tensor.tensor_content = bytes(\"<stripped %d bytes>\"%size, 'utf-8')\n",
+    "                tensor.tensor_content = bytes(\"<stripped %d bytes>\"%size)\n",
     "    return strip_def\n",
     "  \n",
     "def rename_nodes(graph_def, rename_func):\n",