Apply suggestion from @langsamu

Co-authored-by: Samu Lang <langsamu@users.noreply.github.com>

Author: jeswr

src/webid/Agent.ts

@@ -63,7 +63,7 @@ export class Agent extends TermWrapper {
         return SetFrom.subjectPredicate(this, SOLID.storage, NamedNodeAs.string, NamedNodeFrom.string)
     }
 
-    get oidcIssuers(): Set<string> {
+    get oidcIssuer(): Set<string> {
         return SetFrom.subjectPredicate(this, SOLID.oidcIssuer, NamedNodeAs.string, NamedNodeFrom.string)
     }