Fix dashboard permissions

[cristian-ungureanu]

Summary

• Admin users on multisite are now allowed to access Neve Options.
• They should be able to:
  • See all the pages that a super admin user sees
  • If the super admin enables the plugins in the administration menu the admin should be able to activate a plugin but not install one.
• They should not be able to install or click on the install plugins button. They should see a tooltip asking them to ask the admin to install that specific plugin
• They should be able to create Custom Layouts ( available once you apply the changes from Neve Pro )
• They should NOT be able to edit a custom layout in PHP mode ( available once you apply the changes from Neve Pro )

Will affect the visual aspect of the product

NO

Test instructions

• Please test the features described in the Summary section.
• Please check other potential places that I might have missed. Look for buttons that install or activate plugins. For example, they can appear in notices like this one:
  
• Check the tab when TPC is not installed, there is a button there too.
• For the last two points from summary, check https://github.com/Codeinwp/neve-pro-addon/pull/2620

NOTE: Everything else related to TPC will be treated in a separate issue.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes #4036

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🎉 This PR is included in version 3.7.0 🎉

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