Fix bug with potential infinite recursion on 401 error

src/client.ts

@@ -85,7 +85,7 @@ export type CustomClientOptions = {
   customCookie?: string;
   onDownloadProgress?: (progress: number, event: ProgressEvent) => void;
   onUploadProgress?: (progress: number, event: ProgressEvent) => void;
-  loginFn?: () => Promise<void>;
+  loginFn?: (config: RequestConfig) => Promise<void>;
 };
 
 /**
@@ -374,8 +374,10 @@ export class SkynetClient {
     } catch (e) {
       if (config.loginFn && (e as ExecuteRequestError).responseStatus === 401) {
         // Try logging in again.
-        await config.loginFn();
-        return await this.executeRequest(config);
+        await config.loginFn(config);
+        // Unset the login function on the recursive call so that we don't try
+        // to login again, avoiding infinite loops.
+        return await this.executeRequest({ ...config, loginFn: undefined });
       } else {
         throw e;
       }

src/mysky/index.ts

@@ -635,9 +635,9 @@ export class MySky {
    *  Load MySky redirect flow:
    *
    *  1. SDK opens MySky on the same portal as the skapp.
-   *  2. If the preferred portal is found in localstorage, MySky connects to it
-   *     and we go to step 5.
-   *  3. Else, MySky connects to siasky.net.
+   *  2. If a seed was not found, no preferred portal can be found, so exit the
+   *     flow.
+   *  3. MySky connects to siasky.net first.
    *  4. MySky tries to get the saved portal preference.
    *     1. If the portal is set, MySky switches to using the preferred portal.
    *     2. If it is not set or we don't have the seed, MySky switches to using
@@ -651,7 +651,7 @@ export class MySky {
    * Login redirect flow:
    *
    * 1. SDK logs in through the UI.
-   * 2. MySky UI switches to siasky.net and tries to get the saved portal
+   * 2. MySky switches to siasky.net and tries to get the saved portal
    *    preference.
    *    1. If the portal is set, MySky switches to using the preferred portal.
    *    2. If it is not set or we don't have the seed, MySky switches to using