RFR: 8348028: Unable to run gtests with CDS enabled

[Calvin Cheung]

A simple fix in `os::jvm_path()` so that gtest can be run with CDS (`-Xshare:on`). The fix is just to change the directory name from `hotspot` to `server`.
Note that the bug doesn't exist on macOS and thus no change is required for `os_bsd.cpp`.

Testing:

- run gtest with -Xshare:on on linux-x64
- tier1

-------------

Commit messages:
 - 8348028: Unable to run gtests with CDS enabled

Changes: https://git.openjdk.org/jdk/pull/23758/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23758&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8348028
  Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23758.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23758/head:pull/23758

PR: https://git.openjdk.org/jdk/pull/23758