patch 8.1.1143: may pass weird strings to file name expansion

Problem:    May pass weird strings to file name expansion.
Solution:   Check for matching characters.  Disallow control characters.
diff --git a/src/testdir/test_escaped_glob.vim b/src/testdir/test_escaped_glob.vim
index 880f32e..a03c180 100644
--- a/src/testdir/test_escaped_glob.vim
+++ b/src/testdir/test_escaped_glob.vim
@@ -17,7 +17,7 @@
   " Setting 'shell' to an invalid name causes a memory leak.
   sandbox call assert_equal("", glob('Xxx\{'))
   sandbox call assert_equal("", glob('Xxx\$'))
-  w! Xxx{
+  w! Xxx\{
   w! Xxx\$
   sandbox call assert_equal("Xxx{", glob('Xxx\{'))
   sandbox call assert_equal("Xxx$", glob('Xxx\$'))