fix(dashboards): disable and enable buttons with dashboard edit access

[harshithadurai]

Fix function that determines if buttons are disabled when user does not have edit access.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

:white_check_mark: All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
static/app/views/dashboards/detail.tsx	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #81043 +/- ## ========================================== - Coverage 78.49% 78.48% -0.01% ========================================== Files 7210 7210 Lines 319516 319528 +12 Branches 43982 43984 +2 ========================================== + Hits 250789 250795 +6 - Misses 62337 62343 +6 Partials 6390 6390 ```