Fix the test css to match against

tests/test-nested-governance-processing.php

@@ -105,7 +105,7 @@ public function test_get_nested_settings_and_css_happy_path() {
 					],
 				],
 			],
-			'css'      => ' .wp-block-media-text .wp-block-heading{--wp--preset--color--custom-red: #ff0000;} .wp-block-media-text .wp-block-heading.has-custom-red-color{color: var(--wp--preset--color--custom-red) !important;} .wp-block-media-text .wp-block-heading.has-custom-red-background-color{background-color: var(--wp--preset--color--custom-red) !important;} .wp-block-media-text .wp-block-heading.has-custom-red-border-color{border-color: var(--wp--preset--color--custom-red) !important;} .wp-block-quote p{--wp--preset--color--custom-green: #00FF00;} .wp-block-quote p.has-custom-green-color{color: var(--wp--preset--color--custom-green) !important;} .wp-block-quote p.has-custom-green-background-color{background-color: var(--wp--preset--color--custom-green) !important;} .wp-block-quote p.has-custom-green-border-color{border-color: var(--wp--preset--color--custom-green) !important;} .wp-block-heading{--wp--preset--color--custom-yellow: #FFFF00;} .wp-block-heading.has-custom-yellow-color{color: var(--wp--preset--color--custom-yellow) !important;} .wp-block-heading.has-custom-yellow-background-color{background-color: var(--wp--preset--color--custom-yellow) !important;} .wp-block-heading.has-custom-yellow-border-color{border-color: var(--wp--preset--color--custom-yellow) !important;}',
+			'css'      => ' .wp-block-media-text .wp-block-heading{--wp--preset--color--custom-red: #ff0000;} .wp-block-media-text .wp-block-heading.has-custom-red-color{color: var(--wp--preset--color--custom-red) !important;} .wp-block-media-text .wp-block-heading.has-custom-red-background-color{background-color: var(--wp--preset--color--custom-red) !important;} .wp-block-media-text .wp-block-heading.has-custom-red-border-color{border-color: var(--wp--preset--color--custom-red) !important;} .wp-block-quote .wp-block{--wp--preset--gradient--vertical-red-to-green: linear-gradient(to bottom,#ff0000 0%,#00FF00 100%);} .wp-block-quote .wp-block.has-vertical-red-to-green-gradient-background{background: var(--wp--preset--gradient--vertical-red-to-green) !important;} .wp-block-heading{--wp--preset--color--custom-yellow: #FFFF00;} .wp-block-heading.has-custom-yellow-color{color: var(--wp--preset--color--custom-yellow) !important;} .wp-block-heading.has-custom-yellow-background-color{background-color: var(--wp--preset--color--custom-yellow) !important;} .wp-block-heading.has-custom-yellow-border-color{border-color: var(--wp--preset--color--custom-yellow) !important;}',
 		];
 
 		$nested_settings_and_css = NestedGovernanceProcessing::get_nested_settings_and_css( $block_settings );