fix: check masquerade on instructor dashboard tab acess check

[ArturGaspar]

Backports openedx#33684.

Description

Check also masquerading role to determine if instructor tab is enabled, in order to hide it when a user with acess is masquerading as a student role without a specific different user.

Impacts Staff and Instructor users.

Testing instructions

1. Create a course with an enrollment track
2. Preview the course as a staff user
   
3. Use the "View this course as:" option to select one of the enrollment tracks
4. See that the "Instructor" tab is not displayed
   

Deadline

None

Other information

Private-Ref: https://tasks.opencraft.com/browse/BB-8087

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[Agrendalath]

👍

• I tested this: checked that the diff matches the upstream PR
• I read through the code
• I checked for accessibility issues: n/a
• Includes documentation: n/a
• I made sure any change in configuration variables is reflected in the corresponding client's configuration-secure repository: n/a

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