patch 8.2.1921: fuzzy matching does not recognize path separators

Problem:    Fuzzy matching does not recognize path separators.
Solution:   Add a bonus for slash and backslash. (Yegappan Lakshmanan,
            closes #7225)
diff --git a/src/testdir/test_matchfuzzy.vim b/src/testdir/test_matchfuzzy.vim
index 92de8b8..d695456 100644
--- a/src/testdir/test_matchfuzzy.vim
+++ b/src/testdir/test_matchfuzzy.vim
@@ -43,6 +43,8 @@
   call assert_equal(['.vim/vimrc', '.vim/vimrc_colors', '.vim/v_i_m_r_c'], ['.vim/vimrc', '.vim/vimrc_colors', '.vim/v_i_m_r_c']->matchfuzzy('vimrc'))
   " gap penalty
   call assert_equal(['xxayybxxxx', 'xxayyybxxx', 'xxayyyybxx'], ['xxayyyybxx', 'xxayyybxxx', 'xxayybxxxx']->matchfuzzy('ab'))
+  " path separator vs word separator
+  call assert_equal(['color/setup.vim', 'color\\setup.vim', 'color setup.vim', 'color_setup.vim', 'colorsetup.vim'], matchfuzzy(['colorsetup.vim', 'color setup.vim', 'color/setup.vim', 'color_setup.vim', 'color\\setup.vim'], 'setup.vim'))
 
   " match multiple words (separated by space)
   call assert_equal(['foo bar baz'], ['foo bar baz', 'foo', 'foo bar', 'baz bar']->matchfuzzy('baz foo'))