patch 9.0.1936: test: using wrong expected message in test_crypt

Problem:  test: using wrong expected message in test_crypt
Solution: make use of single quotes

closes: #13151

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Isao Sato <svardew@gmail.com>
diff --git a/src/testdir/test_crypt.vim b/src/testdir/test_crypt.vim
index e2eaed8..1782d83 100644
--- a/src/testdir/test_crypt.vim
+++ b/src/testdir/test_crypt.vim
@@ -255,7 +255,7 @@
   call assert_match("Note: Encryption of swapfile not supported, disabling swap file", execute(':messages'))
   w!
   " encrypted using xchacha20
-  call assert_match("\[xchacha20\]", execute(':messages'))
+  call assert_match('\[xchacha20\]', execute(':messages'))
   bw!
   call feedkeys(":sp Xcrypt_sodium.txt\<CR>sodium\<CR>", 'xt')
   " successfully decrypted
@@ -288,7 +288,7 @@
     throw 'Skipped: sodium_mlock() not possible'
   endtry
   " encrypted using xchacha20
-  call assert_match("\[xchachav2\]", execute(':messages'))
+  call assert_match('\[xchacha20v2\]', execute(':messages'))
   bw!
 	try
 		call feedkeys(":verbose :sp Xcrypt_sodium_v2.txt\<CR>sodium\<CR>", 'xt')