Themes: Avoid fatal error loading admin styles when `SCRIPT_DEBUG` is `false`.

This removes the use of `get_theme_file_path()` within `WP_Theme_JSON_Resolver` in favor of the similar `get_file_path_from_theme()` method.

The former is found within `wp-includes/link-template.php`, which is not currently loaded when `load-styles.php` attempts to load the necessary styles. `self::get_file_path_from_theme()` was used previously, but this was changed in [52049].

Props Mamaduka, audrasjb, hellofromTonya, jorbin, desrosj.
Fixes #54401. See #54336.
Built from https://develop.svn.wordpress.org/trunk@52077


git-svn-id: http://core.svn.wordpress.org/trunk@51669 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-theme-json-resolver.php

@@ -363,7 +363,7 @@ class WP_Theme_JSON_Resolver {
 	 */
 	public static function theme_has_support() {
 		if ( ! isset( self::$theme_has_support ) ) {
-			self::$theme_has_support = is_readable( get_theme_file_path( 'theme.json' ) );
+			self::$theme_has_support = is_readable( self::get_file_path_from_theme( 'theme.json' ) );
 		}
 
 		return self::$theme_has_support;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.9-alpha-52076';
+$wp_version = '5.9-alpha-52077';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.