use toMatchSnapshot instead of toMatchFormattedCss

More info: #12170

Author: RobinMalfait

tests/plugins/__snapshots__/forcedColorsAdjust.test.js.snap

@@ -0,0 +1,13 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`should test the 'forcedColorsAdjust' plugin 1`] = `
+"
+.forced-colors-auto {
+  forced-colors-adjust: auto;
+}
+
+.forced-colors-none {
+  forced-colors-adjust: none;
+}
+"
+`;

tests/plugins/forcedColorsAdjust.test.js

@@ -1,10 +1,3 @@
-import { css, quickPluginTest } from '../util/run'
+import { quickPluginTest } from '../util/run'
 
-quickPluginTest('forcedColorsAdjust').toMatchFormattedCss(css`
-  .forced-colors-auto {
-    forced-colors-adjust: auto;
-  }
-  .forced-colors-none {
-    forced-colors-adjust: none;
-  }
-`)
+quickPluginTest('forcedColorsAdjust').toMatchSnapshot()