patch 8.2.1183: assert_fails() checks the last error message

Problem:    assert_fails() checks the last error message.
Solution:   Check the first error, it is more relevant.  Fix all the tests
            that rely on the old behavior.
diff --git a/src/testdir/test_viminfo.vim b/src/testdir/test_viminfo.vim
index 1aadf59..258b472 100644
--- a/src/testdir/test_viminfo.vim
+++ b/src/testdir/test_viminfo.vim
@@ -705,13 +705,13 @@
 
   " Too many errors in viminfo file
   call writefile(repeat(["a 123"], 15), 'Xviminfo')
-  call assert_fails('rv Xviminfo', 'E136:')
+  call assert_fails('rv Xviminfo', 'E575:')
 
   call writefile(['>'] + repeat(['@'], 10), 'Xviminfo')
-  call assert_fails('rv Xviminfo', 'E136:')
+  call assert_fails('rv Xviminfo', 'E576:')
 
   call writefile(repeat(['"@'], 15), 'Xviminfo')
-  call assert_fails('rv Xviminfo', 'E136:')
+  call assert_fails('rv Xviminfo', 'E577:')
 
   call delete('Xviminfo')
 endfunc