patch 8.2.1628: Vim9: cannot pass "true" to timer_paused()

Problem:    Vim9: cannot pass "true" to timer_paused().
Solution:   Use tv_get_bool(). (closes #6891)
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index 5800341..a3a53e6 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1678,6 +1678,14 @@
   bwipe!
 enddef
 
+def Test_timer_paused()
+  let id = timer_start(50, {-> 0})
+  timer_pause(id, true)
+  let info = timer_info(id)
+  assert_equal(1, info[0]['paused'])
+  timer_stop(id)
+enddef
+
 def Test_win_splitmove()
   split
   win_splitmove(1, 2, #{vertical: true, rightbelow: true})