Merge branch 'forbidden-login' into 'develop'

actions/auth: ignore the backend error message, always display "wrong username/password"

Closes #1028

See merge request soapbox-pub/soapbox-fe!1615

app/soapbox/actions/auth.ts

@@ -214,14 +214,6 @@ export const logIn = (username: string, password: string) =>
     if ((error.response?.data as any).error === 'mfa_required') {
       // If MFA is required, throw the error and handle it in the component.
       throw error;
-    } else if ((error.response?.data as any).error === 'invalid_grant') {
-      // Mastodon returns this user-unfriendly error as a catch-all
-      // for everything from "bad request" to "wrong password".
-      // Assume our code is correct and it's a wrong password.
-      dispatch(snackbar.error(messages.invalidCredentials));
-    } else if ((error.response?.data as any).error) {
-      // If the backend returns an error, display it.
-      dispatch(snackbar.error((error.response?.data as any).error));
     } else {
       // Return "wrong password" message.
       dispatch(snackbar.error(messages.invalidCredentials));