Fix TooltipText binding bug

[wingsweiwei]

Pull request type

Please check the type of change your PR introduces:

• Update
• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes

What is the current behavior?

• The TooltipText binding in NotifyIcon is missing

Issue Number: #1426

What is the new behavior?

• The TooltipText binding in NotifyIcon is correct

Other information

Now	Should be