bug(mac): Keyman 19 Installer prompts to delete empty string on completion

[ejschantz]

Describe the bug

When the Keyman 19 Installer completes and you press the close button, it prompts you to delete an empty string ("" Installer).

Expected behavior

The dialog should quote the actual name of the Keyman installer that it is offering to delete.

Keyman apps

• Keyman for Android
• Keyman for iPhone and iPad
• Keyman for Linux
• Keyman for macOS
• Keyman for Windows
• Keyman Developer
• KeymanWeb
• Other - give details at bottom of form

Keyman version

19.0.241-alpha