patch 8.2.1110: Vim9: line continuation does not work in function arguments

Problem:    Vim9: line continuation does not work in function arguments.
Solution:   Pass "evalarg" to get_func_tv().  Fix seeing double quoted string
            as comment.

src/testdir/test_vim9_expr.vim

@@ -1099,6 +1099,13 @@ def Test_expr7_dict_vim9script()
   END
   CheckScriptSuccess(lines)
 
+  lines =<< trim END
+      vim9script
+      let d = { "one": "one", "two": "two", }
+      assert_equal({'one': 'one', 'two': 'two'}, d)
+  END
+  CheckScriptSuccess(lines)
+
   lines =<< trim END
       vim9script
       let d = #{one: 1,