Customize: Prevent breaking the customizer when site title contains templating syntax.

When the site title is inside an underscore template, syntax defined in `wp.template` like `{{ }}` is treated as special characters and will make Underscore treat it as data to be compiled/rendered.

Props pierlo, donmhico.
Fixes #46863.
Built from https://develop.svn.wordpress.org/trunk@46389


git-svn-id: http://core.svn.wordpress.org/trunk@46188 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/customize/class-wp-customize-site-icon-control.php

@@ -64,7 +64,7 @@ class WP_Customize_Site_Icon_Control extends WP_Customize_Cropped_Image_Control
 							<div class="favicon">
 								<img src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
 							</div>
-							<span class="browser-title" aria-hidden="true"><?php bloginfo( 'name' ); ?></span>
+							<span class="browser-title" aria-hidden="true"><# print( '<?php bloginfo( 'name' ); ?>' ) #></span>
 						</div>
 						<img class="app-icon-preview" src="{{ data.attachment.sizes.full ? data.attachment.sizes.full.url : data.attachment.url }}" alt="<?php esc_attr_e( 'Preview as an app icon' ); ?>"/>
 					</div>

wp-includes/media-template.php

@@ -1431,7 +1431,7 @@ function wp_print_media_templates() {
 			<div class="favicon">
 				<img id="preview-favicon" src="{{ data.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>
 			</div>
-			<span class="browser-title" aria-hidden="true"><?php bloginfo( 'name' ); ?></span>
+			<span class="browser-title" aria-hidden="true"><# print( '<?php bloginfo( 'name' ); ?>' ) #></span>
 		</div>
 
 		<strong aria-hidden="true"><?php _e( 'As an app icon' ); ?></strong>

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta2-46388';
+$wp_version = '5.3-beta2-46389';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.