Tweak the prerelease redirects for server/workstation/atomic.

If using the default lang, there will not be a /NN/ code in the url resulting in the redirect failing to work.
So, we drop the / on the end and it works for both /en/workstation/prerelease and /workstation/prerelease.
We need to fix this so users aren't directed to a Fedora 28 prerelease page even before Beta.

playbooks/include/proxies-redirects.yml

@@ -350,22 +350,22 @@
   - role: httpd/redirectmatch
     name: prerelease-to-final-gfo-ws
     website: getfedora.org
-    regex: /(.*)/workstation/prerelease.*$
-    target: https://getfedora.org/$1
+    regex: /(.*)workstation/prerelease.*$
+    target: https://getfedora.org/$1/workstation
     when: env != 'staging'
 
   - role: httpd/redirectmatch
     name: prerelease-to-final-gfo-srv
     website: getfedora.org
-    regex: /(.*)/server/prerelease.*$
-    target: https://getfedora.org/$1
+    regex: /(.*)server/prerelease.*$
+    target: https://getfedora.org/$1/server
     when: env != 'staging'
 
   - role: httpd/redirectmatch
     name: prerelease-to-final-gfo-atomic
     website: getfedora.org
-    regex: /(.*)/atomic/prerelease.*$
-    target: https://getfedora.org/$1
+    regex: /(.*)atomic/prerelease.*$
+    target: https://getfedora.org/$1/atomic
     when: env != 'staging'
 
   - role: httpd/redirectmatch