[rubygems/rubygems] Fix incorrect removal of "ruby" platform from lockfile

When dependencies have changed, we'll be re-resolving, and we can't
really know whether the resolution will be valid or invalid for the Ruby
platform, so skip the removal in that case.

The fix worked, but made some other specs fail, and surfaced that the
`@dependencies_changed` attribute was actually being incorrect set when
explicitly unlocking. Fixed that with an early return.

https://github.com/rubygems/rubygems/commit/20d8f5e5d9

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