[vim/vim] tests: no check that g:netrw_home has higher priority than $MYVIMDIR (PR #21117)

Problem:  No check that g:netrw_home has higher priority than $MYVIMDIR.
Solution: Set $MYVIMDIR to a different directory at the start of the
          test function.

Also, s:NetrwHome() checks has('nvim') before exists('$MYVIMDIR'). This
ordering does make sense as Nvim's docs have no mention of $MYVIMDIR.
Match that in the test.

You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21117

-- Commit Summary --

  * tests: no check that g:netrw_home has higher priority than $MYVIMDIR

-- File Changes --

    M src/testdir/test_plugin_netrw.vim (19)

-- Patch Links --

https://github.com/vim/vim/pull/21117.patch
https://github.com/vim/vim/pull/21117.diff

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