Allow amp-access and amp-subscriptions to coexist

Although the valdiator error is useful for pushing users to
avoid errors, in practice amp-access and amp-subscriptions
appear to coexist fine. This change is needed to allow
amp-subscriptions users to also use amp-access-scroll to
let Scroll customers avoid ads.

extensions/amp-access/validator-amp-access.protoascii

@@ -33,7 +33,6 @@ tags: { # amp-access (json)
  mandatory_parent: "HEAD"
  requires_extension: "amp-access"
  satisfies: "amp-access extension .json script"
- excludes: "amp-subscriptions extension .json script"
  attrs: {
  name: "id"
  mandatory: true

extensions/amp-subscriptions/0.1/test/validator-amp-subscriptions-errors.out

@@ -1,4 +1,4 @@
-FAIL
+PASS
 | <!--
 | Copyright 2018 The AMP HTML Authors. All Rights Reserved.
 |
@@ -71,8 +71,4 @@ FAIL
 | Dialog for non logged in users
 | </template>
 | </body>
-| </html>
->> ^~~~~~~~~
-amp-subscriptions/0.1/test/validator-amp-subscriptions-errors.html:73:6 The tag 'amp-access extension .json script' is present, but is excluded by the presence of 'amp-subscriptions extension .json script'. (see https://amp.dev/documentation/components/amp-access)
->> ^~~~~~~~~
-amp-subscriptions/0.1/test/validator-amp-subscriptions-errors.html:73:6 The tag 'amp-subscriptions extension .json script' is present, but is excluded by the presence of 'amp-access extension .json script'. (see https://amp.dev/documentation/components/amp-subscriptions)
+| </html>

extensions/amp-subscriptions/validator-amp-subscriptions.protoascii

@@ -32,8 +32,7 @@ tags: { # amp-subscriptions (json)
  unique: true
  mandatory_parent: "HEAD"
  requires_extension: "amp-subscriptions"
- satisfies: "amp-subscriptions extension .json script"
- excludes: "amp-access extension .json script"
+ satisfies: "amp-subscriptions extension .json script" 
  attrs: {
  name: "id"
  mandatory: true