Fix flaky test case: test_ctrl_t_unicode

The width of the pseudo-terminal on Travis CI environment can be small
and cause the line to be wrapped.

test/test_go.rb

@@ -1229,7 +1229,7 @@ module TestShell
     tmux.send_keys :BTab, :BTab, pane: 1
     tmux.until(1) { |lines| lines[-2].include? '(2)' }
     tmux.send_keys :Enter, pane: 1
-    tmux.until { |lines| lines[-1].include? 'cat' }
+    tmux.until { |lines| lines[-1].include?('cat') || lines[-2].include?('cat') }
     tmux.send_keys :Enter
     tmux.until { |lines| lines[-1].include? 'test1test2' }
   end