Fix theming manifest tests

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

apps/theming/tests/Controller/ThemingControllerTest.php

@@ -817,7 +817,7 @@ class ThemingControllerTest extends TestCase {
 					[
 						'src' => 'touchicon?v=0',
 						'type' => 'image/png',
-						'sizes' => '128x128'
+						'sizes' => '512x512'
 					],
 					[
 						'src' => 'favicon?v=0',