[ruby/reline] Add missing close to test_rendering.rb

(https://github.com/ruby/reline/pull/573)

https://github.com/ruby/reline/commit/7cd817036e

test/reline/yamatanooroti/test_rendering.rb

@@ -245,6 +245,7 @@ begin
       sleep 1
       write("A")
       write("B\eAC") # ESC + A (M-A, specified ed_unassigned in Reline::KeyActor::Emacs)
+      close
       assert_screen(<<~EOC)
         Multiline REPL.
         prompt> abcABCdef
@@ -690,6 +691,7 @@ begin
       EOC
       write("\C-p" * 4 + "\C-e" + "\C-p" * 4)
       write("2")
+      close
       assert_screen(<<~EOC)
         prompt> if 12
         prompt>   if 2
@@ -994,6 +996,7 @@ begin
       write("\n" * 10)
       write("if 1\n  sSt\nend")
       write("\C-p\C-h\C-e")
+      close
       assert_screen(<<~'EOC')
         prompt>
         prompt>