[jdk17] RFR: JDK-8268557: Module page uses unstyled table class

[Hannes Wallnöfer]

This adds CSS rules for the `details-table` class used in the module summary page. The rules are identical to the ones for the `summary-table` class. The screenshot below shows the module summary page with the fixed stylesheet.

<img width="1120" alt="module-summary-fixed" src="https://user-images.githubusercontent.com/15975/121906627-93175600-cd2b-11eb-8955-c4a72f6aa987.png">

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Commit messages:
 - JDK-8268557: Module page uses unstyled table class

Changes: https://git.openjdk.java.net/jdk17/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17&pr=43&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268557
  Stats: 6 lines in 3 files changed: 0 ins; 2 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/43/head:pull/43

PR: https://git.openjdk.java.net/jdk17/pull/43