patch 9.0.0230: no error for comma missing in list in :def function

Problem:    No error for comma missing in list in :def function.
Solution:   Check for missing comma. (closes #10943)
diff --git a/src/testdir/test_vim9_disassemble.vim b/src/testdir/test_vim9_disassemble.vim
index c1800c3..9334d24 100644
--- a/src/testdir/test_vim9_disassemble.vim
+++ b/src/testdir/test_vim9_disassemble.vim
@@ -2106,7 +2106,7 @@
              '  var aDict = {x: 2}',
              floatDecl,
              '  if ' .. case[0],
-             '    echo 42'
+             '    echo 42',
              '  endif',
              'enddef'], 'Xdisassemble')
     source Xdisassemble
@@ -2163,7 +2163,7 @@
   for case in cases
     writefile(['def TestCase' .. nr .. '()',
              '  if ' .. case[0],
-             '    echo 42'
+             '    echo 42',
              '  endif',
              'enddef'], 'Xdisassemble')
     source Xdisassemble