Remove duplicate permission

In the suggested policy `ec2:CopyImage` was listed twice.

I've also sorted alphabetically to make it easier for somebody who might be recreating the policy in the AWS gui to follow along more easily.

website/source/docs/builders/amazon.html.md

@@ -103,37 +103,35 @@ Packer to work:
       "Effect": "Allow",
       "Action" : [
         "ec2:AttachVolume",
-        "ec2:CreateVolume",
-        "ec2:DeleteVolume",
-        "ec2:CreateKeypair",
-        "ec2:DeleteKeypair",
-        "ec2:DescribeSubnets",
-        "ec2:CreateSecurityGroup",
-        "ec2:DeleteSecurityGroup",
-        "ec2:DescribeSecurityGroups",
         "ec2:AuthorizeSecurityGroupIngress",
-        "ec2:CreateImage",
         "ec2:CopyImage",
-        "ec2:RunInstances",
-        "ec2:TerminateInstances",
-        "ec2:StopInstances",
+        "ec2:CreateImage",
+        "ec2:CreateKeypair",
+        "ec2:CreateSecurityGroup",
+        "ec2:CreateSnapshot",
+        "ec2:CreateTags",
+        "ec2:CreateVolume",
+        "ec2:DeleteKeypair",
+        "ec2:DeleteSecurityGroup",
+        "ec2:DeleteSnapshot",
+        "ec2:DeleteVolume",
+        "ec2:DeregisterImage",
+        "ec2:DescribeImageAttribute",
+        "ec2:DescribeImages",
+        "ec2:DescribeInstances",
+        "ec2:DescribeRegions",
+        "ec2:DescribeSnapshots",
+        "ec2:DescribeSubnets",
+        "ec2:DescribeTags",
         "ec2:DescribeVolumes",
         "ec2:DetachVolume",
-        "ec2:DescribeInstances",
-        "ec2:CreateSnapshot",
-        "ec2:DeleteSnapshot",
-        "ec2:DescribeSnapshots",
-        "ec2:DescribeImages",
-        "ec2:RegisterImage",
-        "ec2:DeregisterImage",
-        "ec2:CreateTags",
-        "ec2:ModifyImageAttribute",
         "ec2:GetPasswordData",
-        "ec2:DescribeTags",
-        "ec2:DescribeImageAttribute",
-        "ec2:CopyImage",
-        "ec2:DescribeRegions",
-        "ec2:ModifyInstanceAttribute"
+        "ec2:ModifyImageAttribute",
+        "ec2:ModifyInstanceAttribute",
+        "ec2:RegisterImage",
+        "ec2:RunInstances",
+        "ec2:StopInstances",
+        "ec2:TerminateInstances"
       ],
       "Resource" : "*"
   }]