[lldb] Remove LLDB_CAPTURE_REPRODUCER override

Remove the LLDB_CAPTURE_REPRODUCER as it is inherently dangerous. The
reproducers require careful initialization which cannot be guaranteed by
overwriting the reproducer mode at this level.

If we want to provide this functionality, we should do it in the driver
instead. It was originally added to enable capture in CI, but we now
have a dedicated CI job that captures and replays the test suite.