RFR: 8368166: Media query should accept multiple rules

[Michael Strauß]

Given a media query with more than one rule:


@media (prefers-color-scheme: dark) {
    .foo1 {
        -fx-background-color: black;
    }
    .foo2 {
        -fx-background-color: white;
    }
}


The following CSS parser error is encountered: `Expected RBRACE`

The reason for this bug is that the CSS parser mistakenly expects that after the first rule was parsed, the media query should be terminated with a closing curly brace. This is obviously incorrect, the fix is relatively simple.

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Commit messages:
 - fix
 - failing test

Changes: https://git.openjdk.org/jfx/pull/1915/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1915&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368166
  Stats: 83 lines in 2 files changed: 55 ins; 26 del; 2 mod
  Patch: https://git.openjdk.org/jfx/pull/1915.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1915/head:pull/1915

PR: https://git.openjdk.org/jfx/pull/1915