[SPARK-32434][CORE][FOLLOW-UP] Fix load-spark-env.cmd to be able to run in Windows properly #29254
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What changes were proposed in this pull request?
This PR is basically a followup of SPARK-26132 and SPARK-32434. You can't define an environment variable within an-if to use it within the block. See also https://superuser.com/questions/78496/variables-in-batch-file-not-being-set-when-inside-if
Why are the changes needed?
For Windows users to use Spark and fix the build in AppVeyor.
Does this PR introduce any user-facing change?
No, it's only in unreleased branches.
How was this patch tested?
Manually tested on a local Windows machine, and AppVeyor build at HyukjinKwon#13. See https://ci.appveyor.com/project/HyukjinKwon/spark/builds/34316409