refine redirect to allow https://fsfe.org/contact/projects-call/projects-call.html but redirect contact$

fsfe.org/.htaccess

@@ -277,7 +277,7 @@ RewriteRule ^community/projects-call(/.*)?$ /contact/projects-call$1 [R=301,L]
 RewriteRule ^community/groups(/.*)?$ /about/groups$1 [R=301,L]
 RewriteRule ^potteries/?$ https://wiki.fsfe.org/LocalGroups/Potteries [R=301,L]
 RewriteRule ^berlin/?$ https://wiki.fsfe.org/LocalGroups/Berlin [R=301,L]
-RewriteRule ^contact /about/contact [R=301,L]
+RewriteRule ^contact$ /about/contact [R=301,L]
 
 # Legal Questions
 RewriteRule ^activities/licence-questions/licence-questions(.*)?$ /freesoftware/legal/faq$1 [R=301,L]