patch 8.0.0472: when a test fails another test may also fail

Problem:    When a test fails and test.log is created, Test_edit_CTRL_I
            matches it instead of test1.in.
Solution:   Match with runtest.vim instead.
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 086e2e4..344c126 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -506,8 +506,8 @@
   let path=expand("%:p:h")
   new
   call setline(1, [path."/", ''])
-  call feedkeys("Ate\<c-x>\<c-f>\<tab>\<cr>\<esc>", 'tnix')
-  call assert_match('test1\.in', getline(1))
+  call feedkeys("Arunt\<c-x>\<c-f>\<tab>\<cr>\<esc>", 'tnix')
+  call assert_match('runtest\.vim', getline(1))
   %d
   call writefile(['one', 'two', 'three'], 'Xinclude.txt')
   let include='#include Xinclude.txt'