Underline try menu keys

Better visibility for color schemas as solarized

Fix: #2564

tmt/trying.py

@@ -64,7 +64,7 @@ def menu(self) -> str:
  index = self.action.index(self.key)
 
  before = click.style(self.action[0:index], fg="bright_blue")
- key = click.style(self.key, fg="blue", bold=True)
+ key = click.style(self.key, fg="blue", bold=True, underline=True)
  after = click.style(self.action[index + 1:], fg="bright_blue")
 
  longest = max(len(action.name) for action in Action)