patch 9.1.0703: crash with 2byte encoding and glob2regpat()

Problem:  possible crash with 2-byte encoding and glob2regpat()
          (after v9.1.0700, v9.1.0702)
Solution: include both bytes for a multi-byte character for an
          escaped character

closes: #15590

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_crash.vim b/src/testdir/test_crash.vim
index d697593..bfd04ff 100644
--- a/src/testdir/test_crash.vim
+++ b/src/testdir/test_crash.vim
@@ -222,11 +222,11 @@
   call term_sendkeys(buf, args)
   call TermWait(buf, 150)
 
-  " let file = 'crash/heap_overflow_glob2regpat'
-  " let cmn_args = "%s -u NONE -i NONE -n -X -m -n -e -s -S %s -c ':qa!'"
-  " let args = printf(cmn_args, vim, file)
-  " call term_sendkeys(buf, args)
-  " call TermWait(buf, 50)
+  let file = 'crash/heap_overflow_glob2regpat'
+  let cmn_args = "%s -u NONE -i NONE -n -X -m -n -e -s -S %s -c ':qa!'"
+  let args = printf(cmn_args, vim, file)
+  call term_sendkeys(buf, args)
+  call TermWait(buf, 50)
 
   let file = 'crash/nullptr_regexp_nfa'
   let cmn_args = "%s -u NONE -i NONE -n -X -m -n -e -s -S %s -c ':qa!'"