Rename tests/phpunit/includes/media files to match class names

The classes were renamed in 9bf39163, this updates the test cases to
match. Also take care of XCF while we're at it too.

Change-Id: Iaaeee93e496af6cdd610df5bc75302ecfe273f64

.phpcs.xml

@@ -78,7 +78,6 @@
 			Whitelist existing violations, but enable the sniff to prevent
 			any new occurrences.
 		-->
-		<exclude-pattern>*/includes/media/XCF\.php</exclude-pattern>
 		<exclude-pattern>*/includes/Feed\.php</exclude-pattern>
 		<exclude-pattern>*/includes/libs/xmp/XMP\.php</exclude-pattern>
 		<exclude-pattern>*/includes/jobqueue/JobSpecification\.php</exclude-pattern>

autoload.php

@@ -1699,7 +1699,7 @@ $wgAutoloadLocalClasses = [
 	'WithoutInterwikiPage' => __DIR__ . '/includes/specials/SpecialWithoutinterwiki.php',
 	'WordLevelDiff' => __DIR__ . '/includes/diff/WordLevelDiff.php',
 	'WrapOldPasswords' => __DIR__ . '/maintenance/wrapOldPasswords.php',
-	'XCFHandler' => __DIR__ . '/includes/media/XCF.php',
+	'XCFHandler' => __DIR__ . '/includes/media/XCFHandler.php',
 	'XMLRCFeedFormatter' => __DIR__ . '/includes/rcfeed/XMLRCFeedFormatter.php',
 	'XMPInfo' => __DIR__ . '/includes/compat/XMPReader.php',
 	'XMPReader' => __DIR__ . '/includes/compat/XMPReader.php',