Pass '/' as an argument to home_url(), preventing possible 404.

In response to a support topic,
where the link wrapping the home logo in
legacy templating lead to a 404 page.
According to the documentation for home_url(),
passing the '/' argument is the default usage.
@see https://wordpress.org/support/topic/need-to-add-slash-to-end-of-url/#post-10293713

includes/templates/class-amp-post-template.php

@@ -113,7 +113,7 @@ public function __construct( $post ) {
 
 			'document_title'        => function_exists( 'wp_get_document_title' ) ? wp_get_document_title() : wp_title( '', false ), // Back-compat with 4.3.
 			'canonical_url'         => get_permalink( $this->ID ),
-			'home_url'              => home_url(),
+			'home_url'              => home_url( '/' ),
 			'blog_name'             => get_bloginfo( 'name' ),
 
 			'html_tag_attributes'   => array(),

readme.md

@@ -68,6 +68,7 @@ Follow along with or [contribute](https://github.com/Automattic/amp-wp/blob/deve
 - Ensure before/after is amended to filtered comment_reply_link. See [#1118](https://github.com/Automattic/amp-wp/pull/1118). Props westonruter.
 - Force VideoPress to use html5 player for AMP. See [#1125](https://github.com/Automattic/amp-wp/pull/1125). Props yurynix.
 - Soft-deprecate `AMP_Base_Sanitizer::get_body_node()` instead of hard-deprecating it (with triggered notice). See [#1141](https://github.com/Automattic/amp-wp/pull/1141). Props westonruter.
+- Pass '/' as an argument to home_url(), preventing possible 404. See [#1158](https://github.com/Automattic/amp-wp/issues/1158), [#1161](https://github.com/Automattic/amp-wp/pull/1161). Props kienstra.
 
 See [0.7.1 milestone](https://github.com/Automattic/amp-wp/milestone/8?closed=1).
 

readme.txt

@@ -50,6 +50,7 @@ Follow along with or [contribute](https://github.com/Automattic/amp-wp/blob/deve
 - Ensure before/after is amended to filtered comment_reply_link. See [#1118](https://github.com/Automattic/amp-wp/pull/1118). Props westonruter.
 - Force VideoPress to use html5 player for AMP. See [#1125](https://github.com/Automattic/amp-wp/pull/1125). Props yurynix.
 - Soft-deprecate `AMP_Base_Sanitizer::get_body_node()` instead of hard-deprecating it (with triggered notice). See [#1141](https://github.com/Automattic/amp-wp/pull/1141). Props westonruter.
+- Pass '/' as an argument to home_url(), preventing possible 404. See [#1158](https://github.com/Automattic/amp-wp/issues/1158), [#1161](https://github.com/Automattic/amp-wp/pull/1161). Props kienstra.
 
 See [0.7.1 milestone](https://github.com/Automattic/amp-wp/milestone/8?closed=1).