patch 9.1.0698: tests: "Untitled" file not removed when running Test_crash1_3 alone

Problem:  tests: "Untitled" file not removed when running Test_crash1_3 alone
          with TEST_FILTER (after v9.1.0695)
Solution: Use a TearDown function instead of another test.
          (zeertzjq)

closes: #15578
closes: #15577

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: zeertzjq

src/testdir/test_crash.vim

@@ -237,9 +237,9 @@ func Test_crash2()
   exe buf .. "bw!"
 endfunc
 
-func Test_zz_cleanup()
-  " That file is created at Test_crash1_2() by dialog_changed_uaf
-  " but cleanup in that Test, doesn't remove it. Let's try again at
+func TearDown()
+  " That file is created at Test_crash1_3() by dialog_changed_uaf
+  " but cleaning up in that test doesn't remove it. Let's try again at
   " the end of this test script
   call delete('Untitled')
 endfunc

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    698,
 /**/
     697,
 /**/