vim-patch:8.2.3102: test for crash fix does not fail without the fix (#20018)

Problem:    Test for crash fix does not fail without the fix.
Solution:   Adjust the test sequence. (closes vim/vim#8506)
3777d6e32b

Cherry-pick CheckUnix from patch 8.2.1432.

test/functional/legacy/cmdline_spec.lua

@@ -5,6 +5,7 @@ local command = helpers.command
 local feed = helpers.feed
 local feed_command = helpers.feed_command
 local exec = helpers.exec
+local pesc = helpers.pesc
 
 describe('cmdline', function()
   before_each(clear)
@@ -158,7 +159,7 @@ describe('cmdwin', function()
     command('set more')
     command('autocmd WinNew * highlight')
     feed('q:')
-    screen:expect({any = '{3:%-%- More %-%-}^'})
+    screen:expect({any = pesc('{3:-- More --}^')})
     feed('q')
     screen:expect([[
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