[MAS2.4.7][Keyboard Navigation -Open bot dialog] Visual focus indicator is not visible on Close button(X)

[Kumar2608]

Actual Result:
Visual focus indicator is not visible on Close button(X) which is present in the open bot dialog

Expected Result:
Visual focus indicator should be visible on Close button(X)

Note: this issue exits for all dialog controls Close button
Note 1: Same issue repro for below path
Welcome bot Framework emulator ->Navigate to the Sign in with Azure account -> Sign in with Azure account dialog

1. Close
   Welcome Bot Framework Emulator ->Create new bot configuration
   1.Close button
   Welcome->Settings
   1.Close button. Etc

Repro Steps:

1. Open the Bot Framework V4 Emulator.
2. Navigate to the Welcome tab screen
3. Navigate to the open bot control
4. Open bot dialog gets opened and Navigate to the close button using tab key
5. Observe the issue

User Impact:
users who rely on Keyboard navigation will be affected the keyboard focus indicator is not visible on control so that keyboard dependant users will be affected to locate where exact position of keyboard focus.

Test Environment:
OS Build: Version 1903(OS Build 18362.239)
Browser: Edge
Application: Bot Framework V4 Emulator

MAS Reference Link:
https://microsoft.sharepoint.com/:w:/r/teams/msenable/_layouts/15/WopiFrame.aspx?sourcedoc={3b98b04f-4fab-4d3e-81af-a0906a34849c}
MAS2.4.7_Open bot dialog.zip

[Kumar2608]

Verified in latest bot emulator Version 4.5.2-78641 and issue got fixed. Hence closing this bug
Now VFI is clearly visible on Close(X) button