web: fix a couple of PHP warnings

[davidpanderson]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes PHP warnings by initializing missing variables before use.

• Adds a call to master_url() to initialize $master_url in weak_auth.php.
• Retrieves the logged-in user before subscription actions to prevent undefined variable warnings in forum_forum.php.

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
html/user/weak_auth.php	Initialize $master_url before calling strpos and substr to eliminate undefined variable.
html/user/forum_forum.php	Call get_logged_in_user() before subscription methods to ensure $user is defined.

Comments suppressed due to low confidence (1)

html/user/forum_forum.php:275

• Add a check to ensure get_logged_in_user() returns a valid user before using $user->id, and handle unauthorized access (e.g., redirect to login or show an error) to avoid null dereference warnings.

$user = get_logged_in_user();

[Copilot]

[nitpick] Consider retrieving the logged-in user once before the conditional rather than repeating get_logged_in_user() in both branches to reduce duplication.

Suggested change

	$user = get_logged_in_user();
	BoincSubscription::replace($user->id, -$id);
	forum_page($forum, $user, 'You are now subscribed to this forum.');
	} else if ($action == 'unsubscribe') {
	$user = get_logged_in_user();
	BoincSubscription::replace($user->id, -$id);
	forum_page($forum, $user, 'You are now subscribed to this forum.');
	} else if ($action == 'unsubscribe') {