Remove unused code in the mixin

arkindex/project/mixins.py

@@ -89,12 +89,8 @@ class NewCorpusACLMixin(ACLMixin):
             id__in=filter_rights(self.user, Corpus, Role.Contributor.value).values('id')
         )
 
-    @property
-    def administrable_corpora(self):
-        return self.rights_filter(Corpus, Role.Admin.value)
-
     def has_read_access(self, corpus):
-        return corpus.public or self.has_access(corpus, Role.Guest.value)
+        return self.has_access(corpus, Role.Guest.value)
 
     def has_write_access(self, corpus):
         return self.has_access(corpus, Role.Contributor.value)