Remove the overrideToken parameter from createOctokit

This was only used from initializeWithToken and only added a completely
separate case to the start of the method, effectively turning it into
two separate implementations. Therefore we can make things simpler by
inlining this case in the one place it is used.

extensions/ql-vscode/src/authentication.ts

@@ -48,18 +48,13 @@ export class Credentials {
    */
   static async initializeWithToken(overrideToken: string) {
     const c = new Credentials();
-    c.octokit = await c.createOctokit(false, overrideToken);
+    c.octokit = new Octokit.Octokit({ auth: overrideToken, retry });
     return c;
   }
 
   private async createOctokit(
     createIfNone: boolean,
-    overrideToken?: string,
   ): Promise<Octokit.Octokit | undefined> {
-    if (overrideToken) {
-      return new Octokit.Octokit({ auth: overrideToken, retry });
-    }
-
     const session = await vscode.authentication.getSession(
       GITHUB_AUTH_PROVIDER_ID,
       SCOPES,