Remove excessive .dropdown-toggle styling from dropdowns.scss
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## Summary
In order to deliver https://gitlab.com/gitlab-org/gitlab/-/issues/204730 we have to put specific style into `app/assets/stylesheets/framework/dropdowns.scss`:
```scss
.dropdown.gl-new-dropdown button.dropdown-toggle {
@include gl-display-inline-flex;
}
```
This is a temporary solution in anticipation of [the new design for Snippets](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/63499/designs) to be implemented in which the dropdown button will be moved out of `.file-title-flex-parent` that is the core of the problem for introducing this style in the first place.
## Improvements
Once the dropdown button is moved out of `.file-title-flex-parent`, we can safely remove this style.
## Risks
No risks as the styles are dedicated to one specific component that, after the design update, won't be covered by this style.
## Involved components
* The affected stylesheet: `app/assets/stylesheets/framework/dropdowns.scss`
* The affected components:
* `app/assets/javascripts/vue_shared/components/clone_dropdown.vue`, and its parent
* `app/assets/javascripts/snippets/components/snippet_blob_view.vue`
issue