Debugger taskbar icon confusing

[jvalteren]

Bug description
Taskbar icon of debugger is indistinguishable from 'Senders of' search dialog.

To Be Completed

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
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Screenshots
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Version information:

• OS: [e.g. iOS]
• Version: [e.g. 1.6.1]
• Pharo Version [e.g 9]

Expected development cost
As you know nothing happens magically, so do you have an idea of the development effort required?
In addition, are you willing to help because after all Pharo is yours too?

Additional context
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